Comment by kqr

I feel you. I occasionally get fairly strong palpitations that can last up to a minute in the worst cases (they seem to come in spells during various times of my life), and it does really feel awful. The first period it happened I got some bad hypochondria. (And I was thoroughly checked up multiple times. Nothing detectably wrong.)

I'm more used to it now, but the sense of doom still passes right through all my reasoning layers.