I Have Noticed A Dull Ache In My Higher Abdomen

i have noticed a dull ache in my higher abdomen region and increased bouts of diahrea. This has been going on for just under 2 weeks, and seems more uncomfortable right after eating. I am almost tempted to not eat and see what happens.
It doesn't matter what I eat, for instance I had some roasted vegetables at lunch time with a lean pork chop. still the same affect... so it doesn't appear to be affected by food.
what should I be concerned about?