I'm so sorry this is happening. It is truly awful and there isn't much I can offer. The only time I was in unbearable pain was during childbirth and I passed out several times because I couldn't take it. Eventually I overcame the pain and just pressed through it, but your circumstances are occuring for much longer on the heels of an already lengthy and grueling journey. My heart goes out to you.
I am hopeful some of our members who deal with incredible body pain often will have some coping ideas for you. Keep visualizing what life will be like when you are free of this. You will get there.