There can be many causes for palpitations, or a "fluttering" in your chest. It can be due to panic attacks, or can be due to a more serious heart arrhythmia. I would ensure it isn't anything more serious before attributing it to a panic attack.
Workup can include an EKG. You may also want to consider an event monitor (a monitor that can periodically record the heart rhythm when you feel the "flutter") which can monitor the heart rhythm. I would also suggest blood tests for any thyroid conditions, which can precipitate arrhythmias. An echocardiogram can also be considered to make sure there are no structural abnormalities.
If negative, then perhaps anxiety could be causing the symptoms. You may want to discuss these options with your personal physician or a cardiology referral.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b