blui my heart goes out to you as both a parent and as a recovering alcoholic. SHame he is 18 and not younger, if he was under 18 you could force him to do a lot of different things, but alas he is 18, an adult under the eyes of the law so without some sort of legal proceding there is little you can do in regards to forcin him into treatment.
Is there any one he respects greatly?
Are his doctors FULLY aware of all that is going on with him? Will he listen to doctors?
Very few addicts/alcoholics ever recover until they want to recover.
My wife, children and other members of my family & friends did everything they could to try and get me to stop drinking and it was not until I wanted to recover that I even stood a chance of recovery.
My wife & family finally totally quit enabling me in any shape, form, or fashion. They left me to face my alcoholism alone.... I finally hit bottom.
My best suggestion to you is to seek help for you and the rest of your family. Go to the Friends & Family forum here and ask for suggestions, Alanon & Narcanon could be a great benfit to your whole family in how to deal with this. Seek out professional help as well.