Lpr gerd diagnosed from endoscopy ,chronic burping and farting with extreme pressure, which can hurt and high pitch noise.could be related to colon?

Yes. : The farting is very likely to be related to your lower digestive tract - your colon. That may be due to intolerance to certain foods - like lactose or gluten - or to malabsorbtion due to an infection - enteritis, for example. May be worth keeping a food journal and see when this happens in relationship with eating, and which foods give you trouble.