I would have this evaluated by a second surgical option to ensure this isn't a complication from the surgery. Typically, pain should not be present 1 1/2 years after the procedure. If not, I would assume that a repeat endoscopy has already been performed as part of the GI workup.
If negative, other tests to consider would be a 24-hr pH study to ensure GERD isn't recurring post-surgery, as well as a gastric emptying scan to evaluate for gastroparesis. Gastroparesis is possible in the setting of stomach distention.
I would obtain another GI and/or surgical opinion and discuss the possibility of the aforementioned tests.
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.
Kindly,
Kitt