Stomach Aches and cramping?

I have been having Stomach Pain for about 5-6 days now, usually after I eat something. I also have cramping like discomfort under my right rib and moves around to my back, it doesnt hurt at all its just annoying feeling. I already went to the hospital and they did a CT scan and said I didnt have appendicitis or any other complications. Do you think it has to do with the Gall Bladder? What do you think it could be?