I have similar issues. I have a pain in the same area that is not heartburn, but feels like a gnawing pit. I also get a red rash after I exercise. It is red spots but not bumpy, and it is around the stomach/waist area, but above where anything would be rubbing to cause it. I also have a soft lump in the right lower quadrant that sticks out when I sit, but not laying down. I think it could be a hernia, but my GP said it is just sticking out because I'm so thin. Also, my gallbladder came back low functioning (15%). None of my docs think it is the cause of my issues, but I still think that it could be because of the hormone/gallbladder connection. I am exhausted from trying to diagnose myself with no medical training!