Welcome to SR L2006. You are not alone as a lot of us are the same as you. We cannot just have a couple drinks to be sociable and when we start drinking it is hard to stop and we often end up saying or doing things we regret.
You are affecting your wife and your son. He sees what is going on. I waited too long before I made the decision to quit and missed a lot of my son's lives as they are grown now. Don't make the same mistake as I did. This is the thing I regret most in my life; not being the father I should have been.
There is plenty of support here from caring people that have been down the same road.