I was walking in the sun for about two hours the weather was very hot it was 45 c i think, suddenly i felt like my heart is racing so fast with PVCs or skipped beats and i was sweating and very fatigued i went to a cool place where i drunk lots of fluids and it all went back to normal(but PVCs lasted for a week then it went away), was it Afib or just heat exhaustion? i want to a cardiologist and he said my heart muscle is fine, i run every day for 6 km, should i be concerned?