After drinking coffee, my stomach began feeling painful and bloated. i also feel nauseous. what could this mean?

Gas: This appears to have been excessive gas accumulation in the stomach brought on by the coffee,the sweetener or simply swallowing air when you drank the coffee. If there was a milk product in the coffee, a lactose intolerance could also have caused gas excess. Drinking hot(not too hot) water or applying heat to the abdomen helps break down the gas and enables its passage through the intestinal tract