Hi ((Trish))
You were asking about Bipolar Disorder, I am Bipolar/Manic depressive, and its mainly a "mood disorder" and chemical imbalance. It can affect you in a way, that you have mood swings, "highs and Lows", and if its combined with manic depression, the way I am, it can send you into deep depressions.
But rather then my trying to explain it, I have some addresses to websites you can go to that can explain it better then I can. They are:
http://www.bipolarworld.net (and)
http://www.manicmoment.org
Or you can go to the top of sober recoverys homepage and click on "Help Index" and get some information that way. I hope this helps. Sorry about not getting this post out sooner, but I just noticed it this morning. Love and ((hugs)) Bonni