Accelerated Junction Rhythm and Arterial Ectopic beats with pause...WTF?

A few months ago I had catheter ablations done as I had SVT and since then I have notice a lot of ectopic heart beats, periods of tightness across my chest and sometimes I get a pain in my heart that last about 1 – 2 secs. I just had an ECG done the other day and it came back that there was Accelerated Junction Rhythm and Arterial Ectopic beats with pause. What does that mean? Should I be concerned about it? Should I stop exercising until I see the specialist again? Thank you