i was walking in the sun for probably 3 hours it was very hot 46 c this day, suddenly i felt my heart is racing and beating so fast with 3 ectopic beats in very few second, i stopped and put my hand on my heart it was beating too fast and strong, i cooled myself down and drank some fluids it all went back to normal(but the ectopic beats lasted for a week), went to a cardiologist he said i'm fine and it's just heat exhaustion, is it AFib or just palpitations with heat exhaustion? should i check again?
ps. i'm 21 and healthy.