Has he accepted any responsibility at all? If he is still all "I do this and this why did you leave me " nothing will change. Have you talked to your younger siblings, they can help you remember too why you left. If you go back at this point he will have more power than ever and you will be held responsible for every bad thought he has. At least make him responsible for his health. He must go to therapy, he must go to the doctor, he must go to couples therapy or you will leave.

Put the responsibility on him. Despite my husbands abuse it was hard for me to just walk out. We got a legal separation and I made his going to therapy, and anger management within 2 yrs a condition of not getting a divorce. That way it wasn't about me leaving it was on him to fix what was wrong....he couldn't do it. So I went ahead with the divorce and he couldn't play the victim because he had the power to stay married.