When my son was your son's age coping with the feeling of being trapped was extremely hard for me. I think I even felt suicidal at times wanting a way to escape.That got a lot better for me with physical distance between us.
The steps to get him out on his own and out of my home were monumental for me with all the hard decisions that came with that process.
Looking back in a positive light I can see that it was good that my son lost his license. Being in jail for short periods of time always helped more than I ever could. He always did much better when he was on court ordered probation.
The greatest sadness I have ever felt was surrendering to the fact that my son is an alcoholic and I can't protect him from all the pain that causes him.
I hope these consequences will motivate your son into recovery.