I think the big issue here that you will have to realize is that you cannot fix this for him. Can he fix it? Yes, if he is willing. You have a baby to deal with, and give yourself about a year trying to fix him and raising a baby essentially by yourself....you have to look at what that would do to you. Your baby needs a stable mother. That would not lend to stability.
You can certainly encourage him to get the help he needs and look at his actions long term. Until then, my advise (since you asked), is to carry on and focus on you and your child.
Big hugs.