Years ago, my angel sponsor ended up in a facility due to chronic severe depression... brought about by years of living with an alcoholic. I think she was bordering on suicide and that's how she got there. While inside, she learned about co dependency and the principles of Al Anon.
It's sad that it has to get to that level before a co dependent person can get help... the closest thing I have found is the serenity weekends offered by our Al Anon groups here in my area. It's a weekend filled with love and support, good meals, much laughter and a lot of healing.