When i cough heartbeat goes very fast for half and hour then all disapears should i be worried?

Nice symptom!: I wouldn't be too worried, but would see doc to eval you for svt ( supraventricular tachycardia) with holter monitor. Wear it and try to make symptoms happen. I am not worried because svt usually occurs at a relatively fixed rate. If it happens again, it will happen at the same rate and not faster. Since you tolerated last episode well, you will tolerate the next.