I don't really have advice to add, but I wanted to chime in with empathy - my AH was using crack by the time everything hit the fan my situation. He's an alcoholic too. Much love to you, I know how hard this is.
My AH also had progressively spent less and less time at home and treated me and our 3 children, the youngest of whom was an infant at the time, like we didn't matter (actually, in retrospect, he treated me/the kids that way the entire time we were together, but I digress). He eventually left and abandoned us altogether, but that has turned out to be the beginning of my renewal.