What you're feeling is very normal and no sign of any heart disease.
I can't be certain, of course, but it's very likely your palpitations during exercise and stressful times with somewhat high heart rate are PACs and not PVCs.
If you are in a hurry during a stressful day, adrenaline levels are high, and some spots in your heart decide your heart rate is not high enough, thus find it necessary to assist your sinus node by creating some extra beats, that are not well timed and interfere with your normal beats, creating a weird feeling. It's really this uncomplicated.
If you were relaxed, doing exercise with easy warm-up in a safe environment, without anxiety, you would probably not get any palpitations. As an example, I got palpitations during exercise and got very scared. During first 10 minutes of a quick walk / jog, I could notice hundreds of PACs. My doctor sent me on a stress test, on the cardiologists office, when monitored, I didn't have a single one (well, I had one, in the cool-down phase). It was a PAC.
I know the feeling when a PAC ruins your day. You get a "****, not again, when am I going to get rid of those things, what was that" feeling.
The question to ask is really: Why am I the "lucky" one to notice my PACs and PVCs? I monitored my girlfriends heart rate for 5 minutes (feeling her pulse) and I found 6 PACs and probably 1 PVC. She didn't notice them and she is not worried.
Worrying about palpitations will cause your subconcious mind to focus more on your heart, making you notice what you didn't notice before. You've probably had them all the time, but you are more aware of it now, causing them to be stronger and happen more often.
You should read my post "Facts about PVCs and PACs" that explains this more in details.
Good luck!
Thank you! and your "Facts about PVCs and PACs is something I go back and give myself reassuance daily. Do you take BB to "ease" the sensation? I think my cardiologist, in order to make me feel less tense or so, prescribe me with Coreg (Carvidilol) since March. Now I take 3.125mg daily, but still thinking if I can come off it since my feelings stay the same and I don't want to put myself into meds at this age yet(40 coming July). I am thinking talking to my doc and come off BB gradually.
Appreciate your and other people's valuable inout on the forum!
I don't use b-blockers due to a physiological slow heart rate at night (38-40). Sometimes my heart rate is a bit slow (low 50s) at daytime too, a signal that my heart is strong and well functioning, but easily irritated by anxiety:)
Anyway, happy to help, just ask if you need more answers :)
Good luck