I have acid reflux and barretts esophagus....in the past 6 months, however, I ve been experiencing pain in my mid to lower right side that radiates around the same area in my back. Also, a year ago, I was taking one 150 mg ranitidine, but last month,the gerd became constant and I now take ranitidine twice a day. Any thoughts on what could be causing the pain on my right side?