I'm struggling to find an explanation for my Abdominal Pain. IBS is one option out of many, and I'm hoping some knowledgeable people here can tell me if it is a possibility?Two years ago, I started getting a vague pain a few inches below my front right rib. Often referred to as 'Right Upper Quadrant' pain, it seems to occur to anywhere in an arc below the lower right rib from say the front (i.e. stomach) round to almost my side. Generally, it's the One O'clock to Two O'clock position if my belly button is 12 O'clock position (hope this makes sense!). It comes & goes, with no clear pattern or timing. Sometimes it feels like a sense of fullness or bloatedness under that right rib, making sitting up/forward less comfortable than standing, as if bending forward at the waste was putting pressure on something slightly sensitive. Perhaps related to this, a full belly after eating can increase the feeling of pain or discomfort.I have tried drinking lots of water (Dr said it could be some kind of intestinal blockage). Blood tests for Liver function (amongst other things) were clear. An ultrasound scan of my abdomen found no problem in the various organs checked (inc. Gall Bladder, Liver etc), whilst a detailed CT scan of my Kidneys showed nothing either.Acting on the suggestion of one Dr that it could be a stomach/duodenal sensitivity, I initially tried taking Omeprazole, which reduces stomach acid production. I felt substantially better whilst taking it (I don't consider myself very 'suggestible', btw) and so was encouraged to think this might be some simple ulcer type problem. So I was checked by endoscope into stomach & duodenum, but no ulcers or anything else was seen. A sample of my stomach lining was at the same time taken for H.Pylori bug test (for possible ulcer cause) but came back negative too. But the taking of the sample (a small pinch of my stomach lining with the endoscope's 'grabber') made me almost jump off the table. This sensitivity was not normal, and surprised theatre staff greatly.An MRI scan of my lumbar & thoracic spine showed no evidence of any nerve entrapment etc which could cause such pain. Years of Osteopathy (for lower back problem) have also not really helped when the lower thoracic rib joint was targeted, this being a theoretical cause.I have a good diet, lots of fresh food (no junk) and have always gone easily and regularly to the toilet. I do not recognise descriptions of constipation, although the 'morning rush side of IBS does sound possible, but fresh fruit & veg can have this effect, I'd have thought? I've experimented with diet, but have yet to find a clear trigger. I've taken Fybogel Mebeverine for a week, which suppresses gut spasms, but don't think it has yielded a convincing improvement.I cannot relate my symptoms to Appendix problems (too high in abdomen for one thing) and so have started to wonder about digestive problems. I am starting to feel like a 'bad penny' at my Dr's surgery, and would like to return well informed for my next visit or else risk being brushed off with some pain killers etc.If anyone thinks I could have, or can't have IBS, or just has some other helpful suggestion, any advice would be appreciated.