Welcome to SR.
I am bipolar and it sounds like his medications may not be as effective as they should. If he is not being treated by a mental health practitioner it is defiantly time he was.
For you I would recommend getting the book "The Bipolar Handbook, Real-Life Questions with Up-to-Date Answers" by Wes Burgess, M.D., Ph.D. The book has been very beneficial to both my partner and I in managing my bipolar disorder. You can probably find it in your local book store or on Amazon.com