I guess as we are all very unique individuals, we can all experience certain things, or feel them in our bodies when others cannot. I was told that when I felt my A-Fib it was because I was so thin! The Dr. said someone with more weight on them may never have noticed them. Okay... :)
I've experienced Panic Attacks after having a heart attack and then stenting, and I understand this to be something that occurs in more than a few people! I also have PVC's. They seem to occur when I'm under more stress, though they have come up when I was just sitting quietly...
Here is a link that you might want to look at if you've not seen it before...
I do hope it helps?! Best wishes to you!