And think about this, too. You don't have a child who will have to go through the sadness and confusion of having an alcoholic parent.
Hugs, feeling sad and empty is normal. I felt the same way when I divorced my first husband--it was I who wanted out of the marriage (nothing to do with alcoholism), but I still cared for him, loved him (though not "in love with him" anymore), and it was the end of that marriage. I didn't feel at all celebratory.
It takes time to get used to the idea, but my bet is that once things start taking an upturn in your life you will be so happy not to have the albatross of an alcoholic marriage around your neck any longer.
Hugs,