If he really wants to get help and change he will. I disagree, I don't think that you should make any calls to anyone for him. If he wants to fix what he broke, if it's important enough for him, he will do it. If it's not worth the effort, then he won't and you will know how he feels.

If you give an ultimatum, be prepared to back it up. Giving one out and then not following through just goes to show that you will allow yourself to be lied to and you will give unlimited chances.

It's up to you. Sorry you are going through all of this, it does not sound fun. I hope everything works out for the best.