Abby, your husband is addicted. And until he truly wants to quit, seeks recovery, and works at saving himself - he's going to continue on the path that he is on.
There is a way to force someone into rehab - I don't know all the details but basically you have to show that he's incapable of caring for himself, is mentally unstable, and other things. And even if you could force him into recovery, there is no guarantee that he'd remain sober.
But let's talk about you.
You say you are sick of the misery but you don't know how to leave your home and allow him to die. Well, he may just do that whether you are there or not - you cannot control him or his drinking. So this is where the focus needs to change. The focus needs to be put upon yourself.
Do you have an active life outside of your home and outside of your husband and his addiction?
There are those that choose to stay with their alcoholic spouse and they go on to live their lives. They detach from the alcoholic behavior, they leave their spouse to deal with their own issues and they go on to live their own life for themselves.
While the choices that are available don't seem appealing, you do have choices. You can continue to live as you are doing - or you can decide to make some changes so that your life is more enjoyable.
You can't save your husband - but you can save yourself.