To settle your stomach after drinking drink some black coffee or drink some carbonated water, plain water or some 7 UP.
Also try eating some toast, bananas, applesauce etc to help settle your stomach.
Other tips to settle your stomach after drinking include.
Drink small sips of clear liquids to rehydrate.
Get plenty of rest.
Refrain from “hair of the dog” or drinking more to “feel better.”
Take ibuprofen to relieve pain.
Eat small bites of bland foods, such as toast, crackers, or applesauce to keep your energy up.
Throwing up after drinking may reduce stomach pain that the alcohol has caused. If a person throws up shortly after having a drink, the body may not have absorbed the alcohol, potentially lessening its effects.
Drinking alcohol even if it's just a little bit of alcohol makes your stomach produce more acid than usual, which can in turn cause gastritis (the inflammation of the stomach lining).
This triggers stomach pain, vomiting, diarrhoea and, in heavy drinkers, even bleeding.