Welcome!!! I read your post and immediately want to step into action and DO something.
I was where you were -- saying "I can't leave" -- and the best advice I can give to you is to find an Al-Anon group. Al-Anon helped me stay sane while living in an alcoholic marriage; it gave me the skills to create a life for myself within that marriage, and build the strength I needed. There are lots of posts at the top of this forum that were immensely helpful for me.
Take are of yourself. That's the most important thing. Because it's the only thing you have any power over in all of this.