A marriage should be a support mechanism as much as it is anything else. It's in the vows. You stay together and love each other and support each other for better or for worse, for richer or for poorer, in sickness and in health.
If you didn't mean those things when you took the vows at the altar maybe you shouldn't be married.
I'm not saying he's not to blame for the predicament, nor that you ARE.
But everything you decribed above has already been vowed by you and by him to be a matter of little consequence to the marriage itself.
Might I add, I come at this from a non-religious perspective, despite the institution of marriage being a religious one.
It's hard work being married. Do I believe that he should work harder to stay employed longer? Yes. Do I think that his bi-polar condition may be partly to blame for his behaviors which may be affecting his ability to remain gainfully employed? Yes. Do I believe that you have an obligation as his wife, having vowed to him that you would, love him in good times and bad, in sick times and in healthy ones, in rich times and in poor times to love him and cherish him and support him? Absolutely yes.
Does he have an obligation to you on those terms as well? A resounding yes.
So where do you go from here? You figure out what the problem is, where the problem lies, and you pick out what will best help for the both of you to see how each is affecting the other's lives.