You are doing the right thing by going to Al Anon. I went there at first to understand my ABF that I was living with at the time. But then I learned it was about understanding myself, and letting go of any responsibility or control over my A's recovery or lack thereof.
You did not cause it.
You cannot control it.
You cannot cure it.
Just take the best possible care of yourself. He is in the hands of his own Higher Power, just as you are. You'll see.