Hi,
I am in a situation very similar to yours. My bf has been sober for almost a year now, but was diagnosed bipolar a few months ago. On the one hand, I was very relieved that he finally got that diagnosis, because I had suspected it for awhile. At the same time, it was also really scary. I was thinking...will he be able to have a normal life? hold down a job? etc....
The good news for your BF is that he is being diagnosed at the same time he's quitting drinking. Mine went almost a year without his medicine (which had previously been alcohol) before he started his new bipolar meds. He now takes Lamictal and it is doing wonders for him. However, I have to warn you....dealing with either of these issues (alcoholism and BP) alone is hard enough. Dealing with them both together can be very difficult. Make sure you don't get too wrapped up in it and make sure to take care of yourself. Al Anon is very helpful. There are also groups out there for friends/family of those with BP. Good luck!
QU