She said he only drinks on weekends, that doesnt really sound like an alcohol problem, imo it seems the alcohol is making his symptoms worse. Secondly keep weed out of this, there is no weed withdrawal and not to mention the only way weed would make him like this is if he was a chronic smoker that completely quit and they would be temporary symptoms, assuming that it even happened.
My advice, being he is verbally and emotionally abusing you, I would make him get help or leave him. Even if he has a disorder at this point it seems you are more affected by his disorder than himself.
Does he abuse anyone else?
Do his friends or yours see his rage episodes?
Does he throw things, punch walls?
This would be a sign of bipolar. In bi-polar you will see up and downs, from your descriptions, I see only highs (mania), does he often get depressed too?
Does he sleep normally, even in these "manic" episodes?
As someone who was diagnosed bi-polar and have recently had a pretty bad manic episode, I know, he needs to know or things may only get worse. Remember bipolar is a cycle, watch for it. I think there's a good chance he isnt bipolar, which is why I made the suggestion to possibly leave him, I worry youre taking to much of the burden here, and from my point of view, I do not know if he might be a physical abuser, if that ever happens just go, it's not worth it. It's your life too, if he will help and stick to it, okay, but if he just says i'll change, or what not, get out.
Edit: wow this is an old post, I think I just wasted a good 10 minutes of my life.