Gayl,
I get them too, but can control them substantially. First, when you haven't had them for an hour and then think about it, your scanning your body for it and will find just about any symptom you are searching for. To stop the palps, when you start getting an episode, (dont know if your a woman), bear down real hard as you do when birthing a child, or bear down as if you are using the small abdomenal muscles in having a bowel movement. Keep doing this and it will quit. I have had the cardiac neurosis, holter monitors, echos, cardiologists, etc., same as you. This tip was given to us at a support group that I used to attend, it does work. Or if you can make yourself cough real hard for about 5 times, it works the same way.
Trish