Problems with my heart, suffer from heart palpitations, please advise?

I have problems with my heart. Besides from suffering from heart palpitations on a regular base and occasional light hediness, I do have a very slow heart beat at 54 beats per minute sometimes. Other than that I feel fine. I was checked by my primary physician and cardiologist. Blood works, EKG, Holter Monitor, Stress Tests, ECG all done and all normal. But I still have the same palpitation and slow heart beat. What can be causing this.

Age: 42
Female
Medications: Nothing at all, I am fine.

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