I know. For so many years I was in this place. Exhaustion, endless insomnia, flashbacks, no sleep, triggered at work CONSTANTLY. I really damaged myself. I was just trying to do the right thing.
Finally, I had to apply for disability. It was a long, traumatizing battle and seems like it took two serious suicide attempts (not to say that's what you need to do by ANY means), but I am on it now.
I've attempted to work again, only to be bowled over by symptoms every time. I even tried volunteering and that didn't go so well.
My advice: start documenting your troubles with work with your docs. You deserve help. You deserve rest. You deserve a break from the constant stress in your body. It may not be so tough for you. Get a lawyer and go for it.
I know the feeling of fending off homelessness and having nowhere to turn.
I'm so sorry you are going through this. I wasted decades of life suffering because I was afraid people were going to think I was a loser, lazy, or a failure. I'm not. I have an illness. And so do you.