just took a nap and woke up with a stomach ache. right now I can't take the stress of going through endoscopy. I had some bread before I took the nap.
Irritable bowel syndrome (IBS)
Each person’s experience with IBS is very different, but many experience occasional stomach pain or abdominal pain.

In addition to stomach pain, you may also experience:

bloating
gas
diarrhea
constipation