OP, I could have written this. Including PTSD from a bad work situation (I quit but might as well have been fired), crap health, poor marriage, and feeling like my kids are the only reason I have to hang on.
I'm not in the same place as you today though. All that is still true, but I'm not feeling that desperate feeling today. I spent some time outside yesterday and I have a small thing to look forward to later this month (a meet up with a friend I never see). I bet you have better days too. Try to do something small to make today or tomorrow better. You deserve a better day.
Hugs to you, and solidarity.