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It is very important for him to stop taking any more alcohol and visit Doctor immediately.Alcoholic hepatitis
can become a serious problem if unattended.The jaundice
is severe according to your explanation.
Alcoholic hepatitis can affect the liver functions and the waste materials dont get filtered.This can cause conditions like mental disturbances , acute liver failure
I sincerely advise you to take him to a Gastroenterologist for complete treatment and deaddiction later on.