Unless you think he's at serious risk for hurting himself, I don't know there's a lot you can do. I don't know that there's anything you can do to compel someone to get treatment if they don't want to.
You can urge him to get help. Not necessarily for your sake or the sake of the marriage, but his own sake.
You say he was like this 3 years ago too? Are you talking about when he wanted to leave before?
Me: 44, Wife: 39 M: 17 years T: 20 years Bomb on 08/25/09 1/13/10: MC started 1/28/10, 2/8/10: More bombs 8/28/10: Wife moved out No talk of D, no movement
