It's interesting. Thanks for the link.
PPIs didn't work for me. They made things worse, but the relationship between AFIB and GERD is a well known fact. Many posts here already talk about that.
It seems that, in some cases like mine, the problem is not acid reflux, but something more "mechanycally" related. More like some pinching or irritation of the vagus nerve due to stomach bloating. I mean : it's as if the inflated stomach was pushing upwards against the diaphragm. Hence pressure against the heart, lungs and esophagus...
I'm still experimenting, but my recent changes in diet seem to give positive effects. Too soon to conclude, but I'm full of hope.