UPDATE:Try adding baking soda to the OJ
I've been drinking oj today. Recently I have been having baking soda in it nearly all the time. Today I had oj and a little baking soda and almost staright after I had some reflux. I then drank half a cup of oj without baking soda and the reflux went away and stayed away.At work on Friday I had nearly two litres of oj through the day. No baking soda and no reflux.
I had frozen mango about an hour ago. No reflux. I'm starting to think it's the baking soda that has been causing the problem.