gastritis from his alcohol ingestion would be high on the list of possibilities. alcohol use can lead to gastric bleeding and ulcers as well. there is no way to accurately diagnose your husband's stomach burning over the internet so i would strongly suggest that he (a) stop drinking and (b) see a medical professional to start the diagnostic process.
my husband says his stomach is burning why? . my husband enjoys drinking this past weekend he dranked from friday-sunday now he has come home and said his stomach is in very much pain and that it burns alot that it hurts.