Agree with the above. PVCs are funny little beats we all have sometimes. If it were me, I wouldn't be concerned. Focus on controlling your Reflux and feeling better.
I think the important part here is that your doctor said: "completely normal" and "nothing to worry about". That's the things that should stick to your mind.
If your heart is otherwise healthy, PVCs, even in pairs, are nothing to worry about as far as I know. Premature beats can often occur in pairs and even in short runs (the latter may be a concern with PVCs if you have a heart disease. PACs often occur in runs).
Acid reflux can often make PVCs worse, and being concerned about PVCs will definitely make them worse.
If you are very afraid, you could ask for some tests to make sure your heart is healthy, but if your doctor didn't suggest it, it's probably not necessary (though it may be reassuring).