Heya Mystery!
I've got a medical background as well, although I don't work in medicine at the moment.
I also tend to make a joke out of most things / in order not to feed the beat.
My longest running consecutive panic attack was 4 months. With an added 6months of intermittent (several bouts a day/night but not continuous). BPs a bit sketchy, not dangerous, but fluctuates enough to be felt (spO2 is peachy in the upper 90s).... but my resting HR is solidly in 120-140. Wheee. The joke I make is that it's exercise for lazy people (not to mention flushing the cholesterol out out damn spot). I've also learned that I can just ignore it and go about my daily business most of the time. My body may be freaking out, but if I can maintain my senses during sports, sex, emergencies, etc. with my HR having a reason to be pounding for a few hours, then I can durn well shop for groceries. Come to find? Yep. Sure enough.
Now, there are pts for whom this kind of cardiac activity would be dangerous on many levels. But, as you said, I'm perfectly healthy. If anything, the longer this went on he healthier the muscle & vessels themselves have become (well, at least that's something... But seriously, tests done before and after show marked improvement). Even if it feels like someone's got an elbow to my sternum. Ow, ow, ow.