Unhappydaze has made some very good points. If you can't get him to talk to a professional, you may find something on line that explains something close to your situation that he may agree to read, if you haven't tried that. My husband has put up with a lot from me for 25 years and doesn't understand even though he has bipolar himself. He has learned to accept that this is how I am, but when I'm not so good I try to put on the smile for a little of the time and encourage him to do some time on his own (so I can have a break too). It is very hard to live with someone who is depressed but even harder to live depressed. I hope he loves you enough to accept, even though he can't understand.
Thank you for sharing with us. I wish you well as you try to work this out somehow.