thanks for sharing your problem,
what is your age? do you have diabetes
, history of angina, thyroid disorder
or history of valve disease? does this happens at rest only and not on exertion? did you ever get loss of consciousness/ blackout
during these attacks?
what i can get from your history is that you have palpitation
and it can be a rhythm disorder in all probability (a rhythm which is not normal in site of origin and has different rate than normal). if it occurs daily and lasts for few minutes, we can get a 24 hours holter monitoring done if it is for a longer duration you can get an ECG during the episode. so that we can pick up the type of rhythm you have during the attacks. but all these are mere speculations , first of all we need to get you examined by your physician and get all the answers asked above.
so see your cardiologist and revert back to us for more information