Stomach Flu?

Patient: Starting yesterday (January 22nd 2012) at about 8:00pm i started to have pain in my stomach. I don’t know if it was something I ate or what but i listened to my mother (who has worked in the surgical tech industry for over 15 years) and she recommended a cold wet towel as i went to bed. When i woke up i felt better until i began to move around when the pain (now worsen) came back. My mom now thinks that i just need to poop (as if some sort of clog in the system)but i think it might be a stomach flu or food poisoning. What is it and what can i do to cure it?