That really sucks, man, I'm sorry to hear it. I don't have a lot of experience with it, though my cousin is now pretty much exactly like that. He overdosed as a young man and that was the end for him, he pretty much ruined his life. I hope your brother will come around again, because he's really been pretty successful considering what he's had to deal with. My cousin is FUBAR. He's better when he takes the drugs, but he's far more generally rebellious about it than your brother, sounds like, and he's caused probably upwards of $75,000 in property damage, stolen cars, threatened people, and is now in a group home. He used to drink a lot, though I don't know about now. He smokes like a chimney, gained a shit ton of weight. Police won't do anything until laws are broken, and clinics can't do much to hold people even when they're exhibiting symptoms. At the very best, all they really do is hold them until they're stable, then let them out ... which is when a lot of them think they're better and then stop taking the drugs. It's been horrible for my aunt.
Anyway, I'm really sorry. I'll pray for you guys, and I hope you can get through to your brother. It would be a shame to see him lose what he worked for. Seemed like he was really doing well.
You need to talk or get out of the house, come hang out, go grab a bite, whatever, let me know, okay? Call any time. And hang in there. Wish your dad my best too ... I hope this gets better for you guys soon.