You and your son have got to stop trying to help him. You didn't break him, therefore you can't fix him. Just as an alcoholic drinks themselve into the universe, he will not stop drinking and seek help until he hits bottom or wants to do it. The same rule applies to mlcers. They do not want to be diagnosed by the family. The more you try to talk to him about seeking help, the more he's going to dig his heels in and not do it. Just leave him be!
just reading along guys- i'd say yes to this - the thing i read about alcoholism that truly did apply to my sister was that if you criticise them - it's a good reason to drink (everyone's againt them) and if you commiserate & "understand" - it's a good reason to drink - it's ok - why not.