When you say your "STOMACH", where is the pain exactly? Divide your abdomen into 4 quadrants... Right upper, right lower, left upper, left lower... where is the discomfort the most? Have you ever had this pain before? Does the pain travel or radiate anywhere (Like to your shoulder blades, into your back, down your sides... etc)... what were u doing when it started? Does anything make the pain better? Any association with food or bowel movements?
Do you take any meds regularly, including OTC stuff like Ibuprofen, Advil etc?