Of all the testing you’ve done, take a SIBO breath test - it’s a kit your doctor or an ND can send you: you own it over 3 hrs & send back where lab tests for levels of methane. If present, very likely you have SIBO. If you do, very specific FODMap diet may be important. There are some natural supplements that work for some to kill bacteria. For some a dual does of select antibiotics may work. I only heard & got on board with this from an ND. Most western docs (w WG gastro specialists) are very ill or non-informed
about SIBO. It’s a huge issue with gastro conditions, both creating & worsening whatever you’ve got. SIBO can reduce stomach motility & cause horrific gas.