You have some PACs, by the sound of it, although I haven't seen your ECG/monitor data. If your burden is less than about 3%, you needn't worry....except they can be highly intrusive and cause unease. IOW, the symptoms and resultant anxiety/fear are the two worst aspects of a sub-clinical case of PACs. From this point on, we can only guess what will happen over the next years. What we can hope, but against hope, is that your condition doesn't evolve to more significant numbers of PACs or other arrhythmia such as atrial fibrillation. I won't go on to suggest that the latter is likely, but....the literature does show that an electrically disordered myocardium does tend to evolve and to worsen over time.

The report is that you don't break rhythm....much. Your symptoms happen while you are in rhythm. I don't know how the arrive at this conclusion, one which you cite near the end of your post, because they have no way of knowing what you feel while the PACs are happening. You'd have had to furnish a log of events...which is usually asked of patients when they wear a Holter or equivalent so that events and symptoms/sensations can be matched temporally. If you did provide a blow-by-blow record of what you felt and noted the time, then I can see how they would know that you're still in NSR when the symptoms take place. What is uncertain to me is why there is a wide range of HR (Heart Rate), that being 56-126 BPM. Were you walking during the higher number of beats, or is this an unknown tachycardia. Your citation suggests no tachycardia is visible.