The thing about alcoholism is that it is truly a family disease. If he has it, you have the affects of it. You get the symptoms of feeling tired, worthless, tired, and more tired. Not unlike a cancer patient, only this is something you are choosing to 'catch' by marrying into it.
You're not just marrying the man, you're marrying the disease.
I'm an ACoA, which is an Adult Child of an Alcoholic. I was a planned child in an alcoholic family. I had no choice but to live in that family. It is a paralyzing place to be as a child. There are after-effects of this that are difficult to heal from. I'm still healing, after years and years of therapy and now getting out of a bad relationship situation myself.
Are you two planning to have children?