sudden irregular heart beat

hello every body , im an epileptic person ,i started having seizures after a cardiac operation due to increase in heart electrecity i am on depakine 500 and my sz is well controlled now but i still have auras and anxiety ,but i realy need your help answering my question [does any one some times feel an irregulr heart beat for less than a second then the heart beat back to normal again?]coz thats what i feel some times and it realy scares me alot after that my heart beat would get back to normal but right after that i feel a terrible pain in my  body and i feel a body sore so idont know is that related to the unusual brain activity and my auras or because of my operation that i had a year ago although i feel good after the operation please im waiting for you answers