Eating something like bread before drinking alcohol will line your stomach, also drinking water between each alcoholic drink will make it less likely that you are sick or get a hangover. Mixing milk and alcohol is more likely to make you sick as the milk will curdle.
Belching, also known as burping, is the act of expelling gas from the stomach out through the mouth. The usual cause of belching is a distended (inflated) stomach caused by swallowed air. The distention of the stomach causes abdominal discomfort, and the belching expels the air and relieves the discomfort.
This article provides some information about flatulence, its causes and remedies. Excess gas in the stomach or intestines causes bloating, belching, or flatulence. Swallowing air through the mouth is the major reason for accumulation of gas in the stomach. Gas is produced in the colon, when bacteria break down undigested food. Intestinal gas is nothing but a mixture of oxygen, nitrogen, carbon dioxide, hydrogen, and methane.