Have had moderate to extremely severe pain for 30 years under left ribs and below. The only time it is absent is on long term ABX
treatment for other reasons-Lyme disease. Pain diagnosed as IBS, diverticulosis(itis). Last 5 years (happens at least once a year for a couple of months), has been accompanied by severe abdominal bloating, unwell, nausea, sweating, etc. Always treated as diverticulitis (do have sigmoid diverticulosis), with short (usually repeated) rounds of ABX.