For the past year, my heart rate has been going inappropriately high. My doctor diagnosed me with inappropriate sinus tachycardia. When I exercise, or do anything that stimulates my heart, it goes way faster than it should. However, what really concerns me are these episodes that occur after a sustained elevated heart rate. If I jog, for example, my heart rate will typically be around 220 for a very moderate level jog. I am only 24 and was a Division I collegiate athlete, so this is NOT normal. However, I also don't really feel symptomatic in these cases.
When I finish exercising, and cool down, my heart rate starts to come down. As it is coming down and I am feeling more relaxed, it suddenly kicks back up again. Out of nowhere it starts to pound so hard I swear it will break my ribs and come out of my chest and it goes back to being really fast. With this I feel intense intense panic, I start shaking like crazy, my blood pressure skyrockets and I swear I will die. No, anxiety is not causing this. The heart episodes come first, then the panic sets in. And I've been through enough of these to be certain that the feelings of panic are a symptom of this, not a mental result. So please don't tell me I have anxiety!
Oh, and when these episodes occur, my at-home blood pressure monitor does pick up an irregular heart beat, every single time.

So, report it to my doctor, you say?? Well I did of course. He did a tilt table test on me, and I did have an episode after I was injected with basically adrenaline. They kept my heart rate up on this infusion, then they stopped it, then my heart started slowing down, then it went into one of these episodes. They told me it was sinus tachycardia, which is a normal rhythm, but I am not sure then why my blood pressure machine, which is very accurate, is picking up an abnormal heart rate. And it sure doesn't feel normal!!!

My cardiologist could not explain it to me at all. He honestly said it was the most unusual response. Great huh??

Does anyone else out there experience this??? I am on beta blockers - they aren't stopping this.