Good Morning Hay,
This is Kitt. Heart palpitations can be caused by anxiety, stress, fear and many other things. Reducing stress and anxiety can help lessen your heart palpitations. Try breathing exercises or deep relaxation (a step-by-step process of tensing and then relaxing every muscle group in your body) at the time of your heartbeat sensations. Also, consider practicing yoga or tai chi on a regular basis to reduce the frequency of your palpitations.
Keep a record of how often you have palpitations, when they happen, how long they last, your heart rate at the time of the palpitations, and what you are feeling at the time. This information may help your doctor figure out both their seriousness and the cause.
Once a serious cause has been ruled out by your doctor, try NOT to pay attention to heart palpitations, unless you notice a sudden increase or a change in them.
I hope this helps you to understand a bit better that this is a sensation that many people, not only Anxious people but people with other diseases also have this same phenomenon. Gentle Hugs to you.