Extreme stomach pains and gas in my stomach, help how can i make it go away?

My quack of a doctor touched my stomach and said 'stress' then gave me Zantac and told me i'll be fine, but the Zantac 75 won't freaking work!! i took 2 like he said, 30 minutes ago and nothing is helping at all! I do have diarrhea also. Like i said, my doctors a quack. But the pains really uncomfortable and I can't sleep and eat at all! My father said drink gatorade or powerade but it's NOT working!how can i make it go away?