Hi there ~
I understand that you have been having a tough time handling your husband's mood swings and feel like he is at the end of his ropes and is contemplating ending his life and has depression
. I concur with you regarding his wanted to be treated. I feel that you have been stressed out yourself with his extramarital affairs. I suppose you both need to see a family therapist who can help you both out with your marital discord and also have you guys be referred to a qualified psychiatrist
so that you can benefit from being treated appropriately with psychotropic medications as well as counseling.
I hope my answer helped. Take care and have a good day !