Were I you, at the moment I would protect yourself and child first and worry about your husband second. If he files for divorce first, it will not go well for you. I would file for divorce and use that and your lawyer to help you "communicate" with him. If he truly wants to make things work he has to start working on them, illness or no, good or bad meds, good or bad church and people he's meeting, etc. You see he is being "unreasonable" and I would stick with that knowledge you have and see at the moment. I would get the divorce and then see where things go from there. If he truly wants it and things even out then you can remarry but you can't protect yourself well if his actions are in charge; I'd "flip" them so you are in charge. He's not thinking of you so you must. You only have yourself and your life to live so do that first and then worry about those around you.
No edit has been made by darkeyes to Perna's reply, just note that this reply is directed to original poster and not darkeyes.
Thanks.