Do you have family or friends that you can confide in? Its embarrassing but people that love you will help you. Confiding to my brother was so difficult but he took me to the doctor, meetings, made sure I didn't forget them. I realise I'm lucky but when I was drinking I thought I was worthless and isolated myself from friends and family for years. But when I asked for help I got it.
If your wife sees you doing the right thing and following doctor and group help she might relent in time. There is always hope.
But do this for you, just think of you for now and be kind to yourself and get as much help as is out there.