I have had a burning pain off and on for about 5 years in my right side while sitting, in recent months it has become worse and more frequent. I have also developed bloating and gas trapped in my abdomen and chest with loose dark stool. I have had a endoscopy , colonoscopy , and ( ultrasound of abdomen, which reveled nothing) some minor problems with intestines. What to do next the pain is becoming severe, it eases off when lying down sometimes.