Others can answer more about CBT, but I would again say that you don't really need to change anything about yourself; it's the situation you're living in that's the problem. If posting on a forum at night helps relieve some of your stress/pressure, then keep doing that.

I'm surprised that the only recommendation was faith-based therapy. I wish you could live with an emotionally stable relative. Is there any chance of that? Putting you on medication without changing the environment is like sending someone back into war with numbing drugs. It doesn't really make things better.

Also, do you think there's a chance someone could convince your mother that therapy would help with your physical health? It might take someone telling her it would be considered neglect to keep you from getting help. You need a good advocate. I wonder if a crisis line could help you figure this out?