I need advice and feedback from readers/blogers about dealing with a depressed, alcoholic, addicted spouse.?

I have been married 30 years and have 3 teenage children. My husband was a good/great provider and wonderful father and pretty good husband until the last 10 years when he began to spiral downward - began drinking heavily, became depressed, lost jobs, started using drugs, addicted to pornography... The last 5 years began to get very hard and the past 2-3 years unbearable. I am working full-time to try to support the family and pay down debt acquired because of his choices. He makes some money but it is never consistent. We separated for a while and I was much happier, but felt sorry for him and let him back home. He is not doing anything to help himself. He eats poorly, is overweight now, doesn't sleep well at night, and then spends his days snoring on the couch. He now has terrible self-esteem and when his stress is too much he binges. We used to live a very upper middle class lifestyle and now I barely make ends meet. My oldest despises him now while the other two are more forgiving. I have had enough and want him out, but he isn't able to support himself. The stress is getting to me. Any suggestions? I don't care about a lavish lifestyle anymore, I just want to pay my bills and be happy and enjoy my days without worrying about him. I've read books, given him names of different doctors, etc,, but he does NOTHING! HELP!