Tell me what you think is going on with my stomach?

Okay, so I get these weird pains in my stomach; it feels like the muscles in it are contracting and expanding really fast. It hurts really bad, like I got kicked in the stomach. Plus, I've been getting motion sickness really badly, and everytime I eat I get diaherra.

I know I'm not Dehydrated I drink 4-5 bottles of water a day.

What could be going on?
 
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