Danny, every case is different and yours will be looked at on its own merits.
I have twice suffered atrial fibrillation, a form of arrhythmia, and still manage to hold down a class 1, albeit with a restriction (as or with co). I still have the symptom from my last event. I have been cardioverted twice (once successfully, once not) and take asprin and a beta blocker.
I have to supply 24 hour ECG tapes to the CAA every 6 months and, so far, they have let me carry on flying.
All is not lost with irregulat ECG traces, a lot more is now know about cause and treatment than used to be and the CAA take a far more pragmatic view now than was once the case.
Good Luck!