I can thoroughly recommend anyone with a heart arrhythmia to buy the AliveCor heart monitor , you can get it from Amazon for about $99 US. It works on android and apple phones see their website for more details alivecor.com
This device allows you to take a heart trace whenever you like and you can send the traces to your cardiologist if your concerned, it saves a lot of time waiting for a Holter Monitor and gives you a good idea of how your heart is behaving