I get palpitations, its all part of my stress and anxiety levels.
Your mind can often play games though, ive worried about having palpitations since they began... and even if I started having them now, the chances are they would still frighten me... but really they are a natural thing that can happen. But still, the irrational part of me combined with alot of imagination makes me thoroughly believe something potentially serious is going on.
Ive been too see doctors so many times to check my heart, and its always top-notch.
I have horrible fears of having a heart attack. My adrenalin gets into my blood and gives me palpitations and such when I worry, or even just for no reason. Just like BAM!
There are other causes of palpitations that arn't serious;
overful stomach
flatulence
constipation
indigestion
smoking
caffeine
alcohol
drugs/medication
general excitement
exertion
fear
infections
the list goes on