Although the alcohol is a bad idea, I doubt that it would have this dramatic of an effect so soon. Many of us has serious infections and issues post Tx, especially because of a destroyed immune system. Just hanging out in public places is detrimental to your health and opportunistic infections, thrush, etc. are common issues.

The only suggestion I can think of is a family intervention with a professional such as a psychologist, minister or some other third party trained in such interventions. Something has to trigger his desire to live and fight this or the battle will be lost I am sad to say.

Being angry at the situation is certainly justified but try not to be angry at him. It won't solve anything and may actually work against the change that you wish him to make.