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You could be suffering from a probable heart condition like arrhythmia
for which ECG is also necessary and probably Holter monitor
by your Cardiologist. The circuit could be Wolf-Parkinson
White syndrome where there is an extra circuit which makes heart very fast sometimes. If this is confirmed you can get permanent cure by Radio frequency ablation of the tract. You can discuss this with your Cardiologist. Avoid stress
. Eat healthy.