You don't have control over his drinking.
You do have control over what you let your emotions do to you.
You know you've made the right decision. You just need to execute it. So buck up, don't look at the contents, box up your stuff and get moving.
Two years after I left my AXH, two of my children have recovered significantly enough that therapy is useful. It took two years to get to that point.
You have an absolute right to get yourself and your children out of the dysfunctional situation you are living in. Your husband is an adult. He can, and should, make his own choices.
And don't stay and think maybe he'll drink himself to death. That can take decades. And you have a life to live and children who need you.