D, I want to welcome you to the forum, and say that I am very sorry for what you and your daughter are going through right now.
I am a sufferer, and not a supporter, so I cannot claim to know how you feel. I can tell you, that my husband suffers from a sometimes very debilitating chronic illness, and at times, for my sake and for the sake of my children, I have learned to put some emotional distance between us so I can go on with life. It may sound callussed, but often, he needs to decide he needs help before he can receive it.
I would encourage you, for your sake, and for the sake of your child, to lay his issues aside for awhile and just work on your own lives and your own relationship. You may find he gets the help he needs, or perhaps not. Either way, you will be better off for it.