usually excess gas causes parts of the digestive tract to overswell painfully
Because the germs get in your stomach and hurts your stomach
Drink a light soda ex:( Sprite or 7 Up) and don't over-do things or you could get sick and throw up. Relax and take it easy for a while. Tums might help as well.
If you have a stomach ache then you take a drink of water, try to go to the bathroom, or you cam lay down and stretch out
usally eating to much bad food or your sick of you might get one after a shot