I’m so sorry for all that you’re going through. Both my younger son and daughter have ibs. While they do have pain gas and sometimes pain in chest it’s not constant or every day. Have you had gi testing? Colonoscopy? Had a Cta of your abdomen? These are all tests I and my kids have had for similar type issues. I actually was diagnosed with two things. Something called mals( look it up) and dis motility in my esophageal muscles.