When I was growing up I was a die hard Ironman fan. Probably 90% of my comic collection was Ironman (I grew up to be an Engineer... go figure).

Tony Stark was visiting a war and was ambushed. He had a piece of shrapnel lodged in his heart and became a POW. He built his suit to keep his heart going and escape from the war.

He might have PTSD, however the only symptoms I remember were alcoholism. He also had a degenerating nervous system, but I don't remember it being trauma related.