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.
Stomach bloating is caused by gas that gets trapped in the intestines and colon. It is normal for the digestive tract to produce gas. Everyone gets gas that gets processed through the mouth and rectum. That gas is produced in the body either by ingesting it when we eat or by being formed during digestion.