@learningstudent - It’s good that nothing was found inside stomach and intestines. Have they done an abdominal ultrasound? Also, an abdominal Doppler ultrasound, which can detect abnormalities in the blood flow of abdominal organs. This particular test helped diagnose one of my abdominal pain problems. There was restricted blood flow in one area, causing pain and discomfort after meals. I also didn’t want to eat or just eat small meals.
It was not something the doctors were thinking of right away. If no cause is found after your last tests, maybe you could mention this to the doctor. The Doppler ultrasound is an easy, noninvasive test.