It sounds like you have palpitations, or the sensation that your heart is pounding, racing, or skipping beats.
This may be a harmless condition, however without more information it is difficult to say. Your cardiologist can check an EKG or give you a Holter monitor to follow your heart rhythm continuously for several days. If indicated, an echocardiogram, or ultrasound of your heart, can provide information about your heart function, valves, and size. Also, your cardiologist may order a stress test to helpdetermine if your chest pain is related to your heart.
i experience this as well. doctors tell me that its my mitrol valve regurgitation. when the mitro valave sticks too long.