in my opinion, it may not matter what drug he's on, seems like the effects on you are the same. i know that its hurts, but you are doing whats best for you. sounds like to me, its his doc and if he's as bad as you say that he is, he may or may not have a new enabler, it maybe that he just don't want you to see him the way he is now. maybe you could really focus on you and not so much on him and what he's doing or not doing, time will tell you what you need to know.
as soon as i would get all comfortable and accepting that my husband was gone out of my life or had found someone else, he would always try to come back bringing all the quacking. try to prepare yourself, just in case, so that if that happens, you'll be ready to stick to your boundaries. keeping you and yours in my prayers.