Have you had a chakra balance? Something is off, or maybe it's someone else you are close too. Do any of your family of friends have digestive issues? Could also be you absorbing everything around you?
And if not any of the above, maybe it's what you are eating? Our food in the states is terrible, diabetes is taking down my whole family, and I'm already seeing it in me and changed my diet. For years the doctors had no idea why I have gerd, and other digestive issues. Once I cut way back on the carbs and sugar, it all went away. When I cheat and have more carbs and sugar it comes back.
Have they checked you for gluten, food allergies, etc? Sounds like the pain is in your large colon, where sometimes I'd feel the pain.