Hi LNW,
Sorry for what brings you here. There is nothing you can do to convince you husband to seek help. He has to want to fix himself. You could talk over and over and I'm sure you have. It wont change until he want's to. I know this is frustrating and you can't believe someone that you love can't see what they are doing to you and to them self. Like Trailmix quoted "You didn't Cause it, can't Control it and can't Cure it (the 3 c's)".
Right now you need to focus on yourself. Al-anon is good. Doing things that bring you joy. All this has helped me get through some tough times. Just knowing that your not alone in this. We are here to help and to listen. There are lots of people here who have lots of good advice. Listen to them. Keep posting and keep being strong.