I've been suffering with ectopics since long time ago but recently I developed a fear that I will have a crazy arrhythmia if my heart goes too fast, and in fact I was experiencing all kinds of PVC/PACs as soon as my heart rate speeds up. it was virtually impossible to do any kind of exercise without having frequent PVCs (maybe PACs), even in bigeminy, but somehow I felt that it was happening because of my panic. I just couldn't confirm, because the results of my Holter were pretty normal and my EKGs / ECHO aswell...
The only way to confirm was trying to stay calm in a situation when my heart would beat very fast, which was impossible. I would enter "panic" mode and start having the crazy ectopics everytime I tried.
Until a few days ago. I didn't know that a very hot shower makes your heart speeds up, and for some reason I decided to measure my HR during a shower. It was beating like crazy, probably 140+, but I was feeling pretty well. For some reason I didn't panic and then I decided to add some exercise, managed to get my heart at 180's for a few minutes, then I stopped and sit down, it went back to 90's and then 80's very fast. Not a single PVC!!
All this story just to show you how bad anxiety and panic are to your heart! I already knew it, but now I'm 100% convinced that my worst arrhythmias were all caused by panic.