What Causes Burning Sensation In Rib Cage And Abdomen?

Hi. I am Fatana 44years old. I had estoctomy on August 2013. Since July 2014 I have burning at my rib cages sometimes at left and sometimes at right side, and sometimes it is moving to different part of my abdomen. When I am hungry my head getting dizzy. most of the time when I eat a banana my dizzy ness getting better. Thanks for your advise in advance.