I relate to this a lot more than I care to admit. I haven't suffered nearly the amount or type of trauma that you have, but I find myself in a similar situation (minus the penthouse, etc). Simple things like having to get groceries send me into a sleepless panic the night before because I just can't...or don't want to. I force myself and I end up coming home utterly exhausted. It's that bone deep tiredness that makes no fucking sense because I didn't do anything physically strenuous.

It seems like somehow as you became happy, something in you let down the defenses you previously met the world with. As the armour came down, all that shit came flooding in and completely overwhelmed you. I hope that makes sense, I haven't explained it as elegantly as I'd have liked, I'm only 1 cup of coffee into my day.

Baby steps. Be gentle on yourself. The world will be there when you're ready.