As suggested by the other posts, you need to keep educating your self on this disease and the various ways to treat it. YOU have to take control and not rely on other people to help fix it. It's very difficult to find a doctor that is willing to try and help you and your individual case. They really just treat you the same as every other person.
I have 3 family members who are bipolar. It's not an easy disease to live with. My nephew who is 21, has basically been removed from the family as he refused to stay on his medicine. No one could deal with him, not even his mother.
My other family member is lucky enough to have someone that truly loves her and is VERY tolerant.
I don't know what to say to you about your marriage. I understand his frustration. I can't imagine though how you must feel too. If it does come down to him leaving, then take that time to focus on getting you better.
Also, just because he wants a divorce it does not mean he is seeing someone else. Being on the other side and watching what it is like to live with a bipolar person is EXTREMELY tiring. Yes it does drain that person, and yes it does tend to take the life out of them. They are constantly fixing the problems that pop up due to the destructive behavior that can pop up(not saying that is your case) I personally could not deal with that on a regular basis.
Not sure if that is you or not as each person is different. I just wanted to point out both sides as you may not be use to thinking of the other side or dealing with that side of it. I am not trying to be mean, ugly, or trying to hurt you. Just open your eyes to maybe where your husband is coming from.
Talk to him about getting you help. See if he will work with you on researching ways to help you, so you can try and balance your life out. Maybe if he was involved with the research it would give him a reason to stay longer.
I feel so badly for you as I know this is not something you have a choice to have and it's so hard to find the right way to balance it out and keep it balanced.
Have you tried looking for a support group for people with bi-polar disorder? I would think this would be of tremendous value to you and your family.
Wishing you much luck and success on your search for the right treatment and praying that you will be able to save your marriage.