Knowledge is power! Learn everything you can about her condition. I'm sure there are support groups that you could attend....either by yourself or together with her. It helps just to knowing that you are not alone and others face the same problems.
My heart goes out to you. Our children's problems feel worse than our own problems. Probably because we really don't have the control over what they do. Atleast not the way we have control over what we do. It makes you feel helpless when you want to fix something for them and can't or you want to help them but don't know how. I once heard someone say "Having a child is like having your heart walk around on the outside of your body for the rest of your life.". I've never heard a more accurate statement about being a parent.
I'm sure you both could use some help and there is nothing wrong with asking for it. Good luck to both of you.