Acoa is a good group if they are active near you. Alanon are easier to find, but as and ACOA I felt like a bit of an outsider there.
The prior comments about the spouse recognizing the problem and wanting to change cannot be understated. YOU can't force the realization on you spouse. They have recognize it for themselves.
You could help yourself by attending Alanon. You can learn coping tactics that will help you from being drawn into the insanity. For your spouse to recognize thier problem, you have to not be there to catch them when they are making bad choices.