I have had any stomach issues before I went on TYmlos. I thought is was GERD but indeed it was not. I had share stomach pain , belched all day, could eat much, woke up at night with stomach pain but no reflux. Aftre months of researach it was discouvered that the PTH hormone was somehow mucking up the pancreatic islets so the enzymes couldnt get to the stomach. The fis was a simple digestive enzyme before meals. Amazing.
If you truly have GERD work with an alternative doc/ preferabley ayurvedic who is knolwedgeable about liver/gallbladder/pancreaes issues. Eastern medicine sees dogestive issues from that lens . I hope this helps. Sending postive energy and strength