Stomach Pain After Eating?

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The last 3 days i have noticed that after EVERY TIME i eat i get a stomach ache, as if someone had punched me square in the gut! Has this happened to any of you? I eat very healthy and I havent changed my diet in any way these last days. So im wondering what could be causing it? Could i be getting sick? Could this be related to diabetes in some way? Gallbladder? Allergy? Intolerance? Please help me! (ps i've lost 20.6 lbs in the past two months, and now i am only 11 lbs overweight, so i am not obese and i have a good amount of muscle, and work out 3 to 5 times a week)