Thanks, Bullekideambule. I also have an exaggerated startle response, so that perspective resonates. I admit I was surprised only to have two responses, both of which supported the hypothesis of skipped beats - a legit hypothesis! Just surprised by the seeming consensus. After reading so many other posts about
these things, I thought people would have more ideas. (On the GERD forum, these are esophageal spasms. On the anxiety forum, these are adrenaline surges. On the heart issues forum, these are skipped beats or A-fib.) It's possible that regardless of what these sensations are, taking a deep breath and not worrying about
them is the thing to do! They have become much more minimal for me over the past week, fortunately, whatever they are.