It's not easy
Tony basically slept for 3 days after taking out his anger and grief on defenseless concrete and other miscellaneous explodeable materials (yay testing ranges!). When he finally surfaced from the stupor of grief, he was told in no uncertain terms by the people who loved him that the issue of the Winter Soldier would be addressed, but not by him.
Jarvis had pulled every piece of information he could find on the Winter Solder program, though he would not share it with Tony (yet - thanks to Rhodey putting protective protocols in place while Tony was recovering from emotional shock). It was clear that though the Soldier was physically responsible for what happened to Tony's parents, Hydra was entirely responsible. They'd kidnapped, experimented on, and tortured James Buchanan Barnes for DECADES, using his skill as a soldier and marksman and reducing him to a tool. And the fact that the man was the best friend of Captain America was likely icing on the cake for the bastards - as if everything else wasn't shitty in and of itself.
Pepper was pulling together a team of mental health professionals who dealt with every aspect of PTSD, torture, brainwashing, cult-recovery - anything even remotely connectable to the situation. Rhodey in his infinite wisdom, and with his extensive military connections, had started digging into how the man's status as the oldest living POW could be used to protect him if he were rescuable.
Jarvis was providing Rhodey with information regarding potential locations where the man was possibly being held, and calculating the feasibility of rescue scenarios. Rhodey was considering bringing Rogers on board - the odds of success increased significantly when he was factored in. Once Rogers had gotten past his own "Captain America" press and buckled down in Boot Camp and Officer Training, he'd proved to be quite an effective soldier. With the additional physical training, he had an incredible degree of control of his strength - and with the psychological support to help him adjust to the 70 year time skip, Rogers was in a much better place to participate in what would be a very emotionally difficult Mission.
Thanks to support from his friends and his therapist, Tony stayed out of the whole thing. He needed to stay focused on the Thanos/Infinity stone situation.
*****
Tony always got a kick out of meeting at the New York Sanctum. SO many cool things! Granted, he wasn't allowed to touch a lot of them cause, you know, possible death or worse, but Magic? A whole other world! Of course, his scientific sensibilities were insulted at first - but "the source code that shapes reality?!?" - The Ancient One had him at "source code"!
It was better to meet at the Sanctum - shielding, protection above and beyond the scientific protection provided by Tony...along with a Stark Special coffee machine and whatever else the Wizards let him install. So far, they had three stones - Space, Time and Reality. Fury'd informed Tony that the Scepter & Mind stone were "missing" and had been for some time. Hydra - again. You can't kill an idea, but Tony was determined to weaken the squid gang - and with Fury, Widow, Hawk-Eye and potentially Rogers working on the non-tech side of pulling them apart, the bastards were in trouble.
For now, though, they had to get the Mind stone away from Hydra ASAP. With the combined efforts of the Masters of the Mystic Arts, Loki, and Jarvis, they'd located it in Sokovia.
*****
Wanda and Pietro had been taken in by Baron Strucker as teenagers.
They'd been angry, and desperate, and as a result they were ripe for manipulation. So when a man with obvious power and connections promises revenge on the person you hold responsible for killing your parents and making you an orphan, it's practically impossible to say no. Strucker had housed them, fed them, gave them work - all things hard to find in Sokovia.
When the work they did for him...changed, they tried to ignore their doubts and worries because it was easier than letting go of the anger. It was easier than admitting you made the wrong choice. Even then, they were both beginning to regret ever coming into contact with him.
When they started working at the castle, the doubts and worries faded... they weren't sure why, but their concerns seemed So much less important. The anger was MUCH easier to hold on to; it was so much easier to blame others when your broken pieces took so long to heal.
When Strucker approached them about becoming more, it was much easier to say yes.
Sometimes the doubts returned, but they disappeared in a blue haze.
*****
With the help of the UN, Tony received permission from Sokovia for the Hydra/Scepter retrieval mission. Fury pulled the team from the original NYC attack together - they all had a stake in this job. The Ancient One herself told Tony she would come along with him - she had shields, and she could separate the stone from the scepter and contain it. Considering the scepter's mind-whammy powers, Tony was thrilled to have her along. He'd have liked to have Loki along but a) he was an Ambassador and only to be called on as an Avenger in magic/high-threat situations and b) no one wanted to expose him to the scepter if it could be avoided.
Team Fury managed to keep damage to a minimum, targeting the main base, while Tony concentrated the energy shield. Jarvis worked his way into the system, looking for the scepter's location so the Ancient One and Iron man could portal directly to it. Tony gave a head's up to the team through the communicators when they got a hit on the scepter.
It appeared to be unguarded - which was SOOO not suspicious at all, Tony thought. Regardless, they had their target in sight so in they went. The Ancient One was first to speak, "We're not alone".
"I'm getting some weird reading," Tony replied. "Let's get the Glowstick of Destiny and get out of here." The Ancient One nodded and cautiously moved towards it, getting within a few feet before a wave of red engulfed Iron Man, bringing him to his knees. The wave rolled toward her, but disintegrated into a shower of gold sparks before touching her. Before she could move to assist Tony - she could hear him having a panic attack of some sort - a blur flew through the room and knocked Iron Man into the wall. She was surprised to "see" a young man in the blur - a benefit of the Time stone, speeding her perception to match his speed.
"We've found the scepter; we're under attack!" The Ancient One announced on the com-link. She shielded Tony and herself tightly against the red-magic-onslaught the young woman in the room continued to send towards her and Iron Man. She then pulled both of the attackers into the Mirror Dimension and incapacitated them. Once they were contained, she allowed her magic to engulf the scepter, peeling it away from the Mind stone and crushing it, while shielding the stone itself and wrapping it safely in a protective magic shell. The Stone almost seemed to welcome it, which surprised her.
She could hear the team had overcome the base and was gathering prisoners and information, but her main focus was Tony. She rushed to his side, calling for Jarvis to allow her access to Tony. She carefully eased her hand along the suit, using her magic to remove any harmful influences of the magic wave that had engulfed him.
The suit opened to show Tony unconscious, but looking as though he was having a seizure. Once the helmet pulled back, the Ancient One placed her hands on his head, gently stroking his brow with her thumbs. His trembling eased, and she continued the motion, calling his name softly.
"Tony"
***
It was RED and he was FEAR.
It was black - never ending, dark, and he was falling. falling. falling.
It was fire - and she was falling. falling. falling.
It was water raging - and he was drowning.
It was pain; he couldn't move - and he was dying.
RAGE! FEAR!
RED! BLACK!
FIRE! WATER! PAIN!
Over and over and over and over.
It was quiet.
He was safe.
She was safe.
He could breathe.
Soft, warm, soothing, still.
It was GOLD and he was SAFE.
"Tony"