You need to see an attorney. Not sure how much help we could be. We do not know the laws for your state. Sounds like it is going to be the same as going through divorce proceedings since you will have to determine who gets what as well as custody of your child.
Have you gone to the public defender's office? They can either help you or send you somewhere to get help. You are right, after you've done everything you can, you just have to go. Do you have family you can stay with while you get this sorted out? If he is using illegal drugs, report him to the police, he'll be out of the house for a while anyway. Is the house in both of your names? Lots of questions. Go see the PD and let them help you.