If he doesn't have a job right now, he could easily get alimony from you in a divorce. Yes the fact that he quit his job for your job will play into that. If you can tough it out til he finds a job that would be ideal if you are trying to avoid paying alimony.
Regarding the custody arrangements, I'm not sure. I would recommend having a consultation with a lawyer who can answer those questions.
If he refuses counseling, you could always go by yourself. It would probably help a lot in sorting out your feelings and figuring out how to best approach the situation. GL!