Wish I could reach thru the screen and give ya a giant hug.
Its amazing how scripted so many stories like ours are, sounds like we steal bits and pieces from so many others. Its so easy to read the advice, but let emotions take over instead. Your far from alone, we just aren't in the same room with you.
I know in my case, moving out for me, although seriously lonely was the best move. I just couldn't take it anymore. I haven't given up, but my mind is telling me to sometimes (ok a lot of the time lately)
Your so brutally honest with your emotional posts, and with yourself. I think you just need to allow yourself to grieve a bit, feeling the pain is part of the process. I think once you've done enough, you let yourself off the hook a bit. Then the detachment feels more legitimate, and not so forced. Its all part of the process of getting there, theres no shortcuts, no way to bypass it. It is what it is, unfort. time is the only cure.
Have a pet? cat or dog? get one if not, sure helps.