Sounds like you've got nowhere to go but up, and that's great. I think Marie has some fantastic pointers.
Think seriously about separating your finances. I don't know if you can file your taxes seperately, but that might be a good place to start. As said before, he's going to do what he's going to do. You have no control over that. But you do have control over yourself, your actions, and whatever little bit of money you can get your hands on.
Being broke may feel good now, but I'm sure you realize that staying broke isn't a good longterm strategy. Either for your family's well being, or for his sobriety. Even many homeless people still figure out how to drink. Please try not to let your complacency with poverty lull you into an acceptance of this situation. I know you want better, and you deserve better.
Good luck, hon.