Hi thanks for posting on HCM The pain you describe may be caused by many medical conditions: -GERD since its a condition your are suffering from already. -Lungs infection/chronic obstructive pulmonary disease(COPD) -Liver/gallbladder pathologies I will suggest you see your Doctor for examination and investigations.Tests like *A chest Xray to look for lungs infection *A respiratory function test/spirometry to look for COPD *An abdominal ultrasound to evaluate the liver *A live function test *H pylori test since common in people with GERD/gastritis From the results, your Doctor will know how to manage you better.In the meantime, i will suggest -You take an anti-secretory like omeprazole -An antacid/antireflux like topaal -A pain medication like celecoxib since it has limited gastric effects -Take enough fluids -Avoid foods that aggravate symptoms of GERD -Eat frequently and in small quantities -Avoid smoking Your Doctor will take care of the rest of the management from the test results. Hope my answer will help you Best regards