Im very itchy after a night of drinking alcohol?

This may be more of an alcohol intolerance rather than a true allergy where other manifestations of allergy occur. Your body may not produce enough of the enzyme(DAO) which prevents histamine intolerance seen in cases of itching after drinking alcohol. If antihistamines don't help, DAO supplements could be tried to lower the histamine levels in your body.Read up. Use according to instructions.