Hi I am 21, 140 pounds. Lately I have been having stomach problems. Almost every time I eat I get a cramp on my left side under my ribs. I was a collegiate athlete and just stopped being extremely active, but the cramps feel like a running cramp. Its very sharp. My stomach also hurts like there is a huge knot or I ate a rock and I become gassy or have diarrhea. Pebto does not help. Is this something serious or is it just having a poor college student diet?