Well, sobriety doesn't create happiness, it just makes it easier to recognize. He sounds angry, depressed, possibly anxious--all things that often underlie our drinking behavior, as we use alcohol as a means (ineffective as it is) of coping with those things. So he's achieved sobriety, but not dealt with the underlying issues.
If he won't get a new sponsor and won't go to counseling, one of you is going to have to try to deal with those things on your own. There are lots of resources on line. I'd be happy to discuss this more with you on the Alcoholism forum, since I'm not in AA.
Don S