I went through a period where I had excruciating abdominal pain
after eating, but it was usually delayed by an hour or two
after meals.
After being put through just about every test I can name by the GI specialist and coming up empty handed, my general practitioner tested a theory and changed my nexium from once daily to twice daily. The pain completely stopped. I may have had an ulcer in the part of my intestine that isn't visualized either in the endoscopy or the colonoscopy ...