I happen to have PTSD IRL, too - although it derives from me being scared of screwing up, and I'm batshit terrified of hurting another person because I screwed up. And it doesn't help that I viciously hate and loathe myself for my flaws, too.
Having romantic relationships is actually very hard for me in fact, because I openly fear hurting the other person, and half the time in the relationship is the other person trying to keep me calm enough so I don't go insane from nihilist fear.
And whenever things actually go good for me, I often beat myself up because I am haunted by the feeling that I don't deserve it.
To many, intelligence may be a blessing, but for me, it's a curse. Yeah, it makes me able to accomplish great things and makes me able to excel in science, philosophy, computer-programming, and a bunch of other things needing no mention, but it also makes me see horrible pain and misery in life a lot faster than other people, and leaves me overthinking and fearing every possible outcome.
I honestly sometimes wish I was mentally-retarded so that I'd be too dull to understand what pain is and actually have a shot at living an actually happy life.
Sorry about the rant; I don't often talk about my often-derailed emotional state because I don’t want the people who care about me to freak out over something that is as miniscule and insignificant as me. ._.