Emma-lou check out this site
http://www.psycom.net/depression.central.bipolar.html There is alot about bi polar in it.
http://www.crazymeds.org/ Look up the drugs on the side Old School Mood Stabilizers to read about lithium. Good luck. I want to add to what Pedagogue said about the dominant/submissive dynamic in your relationship. It will cause problems. Especially with his illness being untreated. I had an experience like this and it led to the 7th Ring of Hell. Educate yourself on his condition for now. And I wish you luck. I really hope things work out for you.