I did once, but that was the time i really need money to spent. But not my true nature though in fact i am a true holder if i know the token i been holding is too much potential then i am willing to hold it even if its months or years.
Panic selling is an obvious for an inexperienced traders and investors. It's ok when you don't have enough experience and make some mistakes at the beginning. After some time you come to knowledge and patience and stop making panic decisions.