I can't imagine having gone through this, and I'm so sorry both you and your son had to go through something so heartbreaking. Alcohol is a snake and takes over far before most of us realize it. My father is a raging alcoholic and we are feeling pretty scared as of late that we will lose him to the bottle. He's only in his fifties. He just can't give it up and doesn't know how to cope with daily stressors and the demands of life any other way.
Thank you so much for being open enough to share this story. From the comments, it's clear many others can relate to your experience, too, and in their own way.
I hope you've been able to find peace since losing your son.