Mutsy- Also anxiety does affect your resting heart rate. The anxiety resting heart rate makes the heart beat above the norms when there is no activity.
However, if you find any abnormalities with the rhythm of your heartbeat, you should see a cardiologist so that he could perform an echo to determine if you have any form of heart disease.
You also may want to jot down when you experience the rapid heartbeat to see if the reasoning is conclusive with anxiety or some other heart related condition. The average resting heart rate for a healthy person should be no more than 80 beats per minute.