Adrenaline induced arrhythmia

[is_something_wrong]

Sorry to bring this up again. I just need something cleared up.

I got a Holter last summer for events of rapid irregular heart rate when walking up hills (I got severe anxiety when exercising, triggering this). The irregular heart beats stopped after I relaxed, and my heart rate slowly reduced. I got symptoms during exercise when monitored, though not extreme. It turned out to be just PACs, and I even had some of them outside the setting of exercise. My cardiologist wasn't worried at all.

My GP sent me to stress EKG afterwards for some reason. I achieved a HR of 210, NSR all the way. No ectopics. Everything normal. I asked for an echo. Everything normal. Resting EKGs are normal.

This year, I get some ectopic beats during exercise, but more worrisome, they can turn into a (perceived) extremely rapid, "light", regular heart rate (never measured it exactly, but RAPID!), has happened 4 or 5 times, all with extreme adrenaline levels. It settles almost immediately after I relax and catch my breath, and only last for some seconds. It feels like my heart has an extra gear. I'm not sure if it stops "abruptly" or not, because my "base" heart rate is very high too.

I don't get dizzy. I don't get any chest pain or SOB, except what I expect during panic attacks. No SCD in family.

My GP wasn't concerned (gave me an ultra low dosage, 10 mg propranolol and it works great, no ectopics during exercise in 3 months now) before I told him about the CPVT diagnosis which he didn't know about (I've read so much about cardiology that I feel he's asking me for advice sometimes). Then he quickly referred me to a hospital. They obviously didn't worry, because I get to see an internist next summer (lowest priority).

I hope you can answer this:

1) What are the chance of CPVT in my case?
2) If Holter revealed just PACs, how likely is it that I feel PACs during exercise now (without b.bl), and not PVCs?
3) What arrhytmia do you think causes the rapid HR? AET perhaps?

[Cleveland Clinic]

1.  That would be hard to determine without further studying.  It usually runs in the families so if there isn't anyone affected I would say based on things you've described above that the risk is low.  There is testing that can be done (genetic) to determine that but I wouldn't go that far if I were you.
2.  Very likely, you may even have runs of short atrial tachycardia (many PACs in a row).
3.  Atrial tachcyardias

[is_something_wrong]

Just to clear up - a little mis-spelling.

I told my GP about the CPVT disease - not diagnosis. I'm not diagnosed with this!