I have had that exact same sensation you describe - it happens only a few times a year but that describes it perfectly! I've never been able to catch it on a monitor but always suspected it was runs of PACs or PVCs.
Wow. Several runs a day. Do you ever get Zapped by your ICD? You obviously tolerate it very well, physically and mentally.
Your definitions are perfect, and so is your response..........in a normal heart NSVT is fine. I think that has been said many times on here. I have long ( well, 10-14 in a row) runs of VT, almost daily..........it just feels......... weird. I have had 5 minutes of it, and did not pass out or even feel faint. ( my heart rate was 188) Everyone is different. It depends a lot on what you are doing. The heart is so amazing. I go now.I don't want to post on here, but your post was so good.
V tach is not dangerous in a normal heart. Studies have shown that on any given day approximately 3% of the population with normal hearts experience non sustianed v tach. I think it probably feels different to different people. I think I have experienced it twice and it was like one PVC followed by a sensation of my heart rumbling ant tumbling before my normal rhythm kicked back in after a few seconds. I can't be sure that was it though. And it's only happened twice for a few seconds so I'm not too worried (although it freaked me out at the time!). I've only ever had frequent PVCs caught on a holter though.
3 pVCs in a row without a regular beat in between would usually be classed as a short burst of non sustained v tach.