I remember when I had gas and took OTC medicines.... tums, ect.... then when I finally went to a gastrologist they found a four inch segment of Barrett's Esophagus (a condition caused when acid reflux, GERD, starts destroying the natural lining of your esophagus so it starts replacing it with a lining similar to the lining of your intestine to protect itself against the acid). The treatment then went to RFA, radio frequency ablation, where 3 microns of the lining is burnt off. Then you keep the acid off and the natural lining will regrow. This requires multiple endoscopies and biopsies of your esophagus. I still have a follow-up endoscopies every year.