I was very sad when I read your post. Please don't give up. I can't even imagine what you are going through but it must be horrible. There has to be an answer out there for you.
I agree with Tommy. Could you seek help from clergy? Also, I do think you should try a different doctor. This one doesn't seem to be helping at all. Have you tried Xanax for the anxiety? It has helped my Sister tremendously to cope with all her problems.
I will have you in my thoughts and prayers. Hang in there.