I think that you need an endoscopy
to confirm that sore throat
is because of GERD or for any other cause.
And ack pain (dull) on right side just below ribs, may or may not be due to gall bladder
problem. An ultrasound
along with proper physical examination are needed to establish diagnosis. Further management can be planned based on results.
Stay healthy and thank you for consulting! You can contact me again anytime, if you need clarifications or further assistance in future. Kindly rate the answer if you are satisfied.