I had burning in my upper intestine also even having surgery for reflux. Turns out I can't digest fiber very well and it sits in my upper intestine fermenting and causing gas and acid and bad pain and even pushes up me rib cage ! I had to cut out all fruit, most vegetables and breads, pastas, etc! I know we're told we need these foods but some people like me have a malabsorption problem for whatever reason. Once I eliminated it the pain went away almost immediately. Every now and then I eat some fruit which I love and get the pain within the next several hours! Love salads but had to cut that out also! Try the elimination diet, you may find it's your diet!