This used to happen to me (like a stong pulse,but not the heart, more at the bottom of the stomach?)
I ended up in and ER once for it, they diagnosted it as taxychardia, and offered 3 choices:
a) take beta blockers/anti-anxiety meds,
b) have a pace maker installed in my chest
c) learn to ignore it
After esp the 3 rd choice I got a bit concerned, suspicious that my MD didn't know what he was talking about.
Long story short: took me a while,but I opted for the natural way, and started cleansing my liver first, then the GI track.
The rapid pulse was, I suspect caused by the pressure of my liver/enlarged gallbladder on either portal vein or some artery.
As I cleansed the liver- I remember all the abuses I put my body thru when younger- got alot of stones out.
As the toxins in my body were elimimnated, my health dramatically
So, perhaps you should consider doing a liver flush?
Take care... :)