I may be wrong here, but i wouldn't bother going to C session at all tomorrow. Grab a little power back for yourself. You really don't have to dance to his tune. He wants his cake right now and the C is condoning it. Plus, it might shake things up a little.
And, I thought that DBing was to take care of you, not keep suffering these indignities in C that don't seem to working anyway. And we DBers are supposed to stop doing things that don't work, right?
I'm so sorry and I know how much pain there is. It is so frustrating to listen to the f'ed up sh*t that comes out of their mouths. And to have a C that keeps egging it on is just too much. I think they both are getting some kind of perverse pleasure from inflicting this pain onto you. That C sounds very unprofessional.