Severe abdominal pains 2 years?

Two thoughts; first do some research on irritable bowel syndrome, could be this. Second, Have you looked into food sensitivities? There could be foods that your body can not digest so it tries to eliminate any way it can. Milk, eggs, gluten (flour) products are a few comman ones. Instead of a GP you might see a gastroenterologist (specialist in GI tracts), or an allergist.