Glad you found this message board, although I am not glad for the circumstances you are here. There are alot of wise people here with good advice.
I, too, married an alcoholic, only I didn't know the extent of his problem till after we were married. My H had bad erection problems due to his drinking and we have had the SSM problem for most of the marriage, it will be 23 years this november. H has not drank in 10 years now and he too suffered heart attacks and heart bypass surgery. My H became very boring after he stopped drinking lol. He was always a home person, and it got worse then.
I have not actually talked to H about what I feel or want, so I really can't give you any advice as to what to do. I have not read any Schnarch either. I know that with my H after the heart problems he became very depressed, which he refused to acknowledge. Its been about 6 yrs now since his surgery and just this past January he decided he wanted to make things better between us. (up till then, sex was nonexistant for about 10 yrs)
It sounds like your bf is willing to address these things. I wish you all the luck.