Hi welcome to health care magic forum,
Throat pain may be infective or non infective.
Noninfective may be due to extraesophageal disease.
As your endoscopy
report suggested acid peptic disease
, so your doctors advised you 3 month course.
If still no relief after a 3 month course of antireflux medication than a review is needed.
In my opinion you can see an gastroentrologist for a second opinion
You can undergo for a second upper GI endoscopy and an ambulatory PH monitoring if available.