The endoscopy is normally a pretty comprehensive test that would rule out many major esophageal disorders. Motility studies can be considered, since a reaction to cold fluids can be caused by a esophageal motility disorder.
Right upper quadrant pain radiating to the back should be evaluated for an ulcer as well as pancreatitis. The endoscopies can exclude an ulcer. Imaging with a CT scan as well as blood tests can evaluate the pancreas.
Esophageal cancer would be appropriately evaluated with an endoscopy - if suspected, this should be repeated.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
www.kevinmd.com