Another option if a heart monitor test doesn't capture anything is that you can ask your cardiologist if she/he can get you a device called KardiaMobile, which is a mobile single lead ECG device. It syncs with an app on your phone. If you're experiencing symptoms you just grab the device, and place your fingers on it and it records your heart activity and stores it.

I had A-fib for years and finally had an ablation to correct it, but I still have PACs, PVCs and SVT left over. My cardiologist said it's all benign, but even after 8 years I still hold my breath in fear when these anomalies happen, because they feel too much like the old A-fib.