I'm no doctor, but have been in this forum for some times, and I have/have had symptoms not excactly like yours but something like it.

How can the doctors "free" your heart when no palpitations happen when they take the ecg?
In my understanding it is because benign palps - as yours probably are - so to speak exist in "another level". They don't originate from a sick heart. If you had a heart disease, it would show on the ecg. Benign palps originate most often from outside the heart and affect via the vagus nerve the heart and make it beat when it shouldn't. But at the same time the old heart keeps beating it's basic rythm all the time and is not disturbed in any serious way AT ALL
"Our" doc in the group, RLR, has many times written that benign can manifest themselves in many different ways without that beeing any reason to worry.

It is most normal that "episodes" in the GI tract - i.e. eating and also digestion can trigger benign palps.
I have experience that late intake of too much food, alcohol, coffee might trigger palps at night. Most disturbing. But it never ever got any worse. And as you see, I'm still alive and writing

The "one-two-three-stop" thing I don't know about. But I guess it is just another way for palps to present themselves.

Anxiety can make your nervous system more prone to send off "wayward impulses" - not right away maybe but on the long run. For that reason it might not be so wise to check your pulse all the time. Cause that'll make you focus on you sensations all the time, which easily can be anxiety-provoking.

But do go back to your docs when they open, and meanwhile try not to focus on the small bastards ...

Have a nice weekend.

I get the same pattern, beat beat beat .... BEAT. If I decide to get upset about it sometimes it ends being more often. And mine is always associated with trapped air, and when that air gets trapped high enough it could be every other beat until the air moves out. Then it stops.