<< but being with him seems to have shrunken my social support, my friends seem to have vanished. >>
Have you tried reaching out to old friends? I know leaving my ex was really hard because I had alienated my friends b/c of all the things that go along with being with an alcoholic (covering up, avoiding them to avoid embarassment, etc). I have found that reaching out to my friends and letting them know what I was going through has brought them back into my life in very helpful ways. I know reaching out can be scary b/c of the fear of rejection. But, its so worth it!!