hi katie,
it sounds like you've done all you can do..you've been supportive, listened, and given your friend some good suggestions. i know it's hard to not want to help any further but he's given you the heads up on that. maybe he just needed to vent..or is feeling down on himself with the holidays approaching. does he have family in the area he can go see?
sometimes i have to sit on my hands(!) because i want to help someone soooo bad but i've learned, for me that is, that i have to "let go" with love. if he feels out of control there's always the emergency room if he doesn't have any other place to go over the holidays and he hits rock bottom. (not that i recommend that but ?) he would be more helpful to himself tho to talk with his T, but since he doesn't want to, what's to do???
holidays are stressful to most people and at least he's looking at that and telling you his thoughts...but if he doesn't want to get help he won't feel any better.
i'm sorry that he's hurting and i hope i don't sound stern..but it's his recovery and there's little more you can do. perhaps someone else has a better answer but hope this helps you.