If your son refuse to go to the doctor, then you need to go without him. He will end up allowing his drinking problems to ruin his life. You need to seek professional assistance from a neutral source like a psychologist or a family therapist who can provide you with intervention and coping strategies in dealing with the problems of your adult son. It is hard to change another person...like your son...but we can change ourselves and our reactions to others' behavior. Seek help for yourself so that you can feel more comfortable in dealing with the situation. I wish you the best of luck.
PLease ACCEPT if this has helped. Have a great day!!!