The only way to check the nature of this rhythm problem is probably to see a cardiologist and get either a 24 hour ECG (EKG) which records for the full day and will pick up and allow identification of a problem if it happens at least once during the trace, or what is called a cardio-memo. This is left with the patient for a week, if the problem is less frequent, and the patient turns it on when the feel the palpitations. All these tests are harmless painless and non-invasive.
Usually a resting ECG(EKG) and a thyroid
, full blood count, electrolyte check is done first by your family doctor.