Like Laurie said, that is a very normal sensation.
Your wrap is going to swell over the next week or two and sometimes the swelling is uneven and some reflux comes up.
The esophagus is dumb too, it only can feel a few sensations so everything kind of feels like reflux...I cant even burp most of the time, but my esophagus still burns on occasion like I have heartburn...its just stupid and doesnt know how to express itself properly :)
You should not even begin to worry. Just relax. I know easier said than done, but really try to relax and just let your body heal you have been through a lot