Thank you for your health concerns. The symptoms are suggestive of an electrical problem of the heart, an arrhytmia, which needs to be characterized and labeled with a more prolonged study such as a Holter. There are many of these rhythms, including advanced heart blocks, symptomatic bradycardia
and abnormal pauses that put you at risk for accidents mainly, and a pacemaker could be indicated if such abnormalities.
I am glad that you are following up with your physician, if you have worsening symptoms would strongly suggest accessing urgent/emergent care services.
Hope that is helpful, wish you the best health,
Dr Brenes-Salazar MD
Mayo Clinic MN