Hey there!
A question of panic selling was already discussed on this forum a billion times. But whats bad here? If you are sure that the price will grow back then you can just buy some BTC in better rates. The more dangerous will be the situation when someone is buying BTC while being afraid of loosing some profits despite the fact that pump has already happened (I'm calling it a panic buying). Thats seems like a straight way to lose money and make a bubble.
It's normal for a human being to act like that because you are investing money that you have worked for but before investing you need to get a lot of advice and research and of course experience so you can combat stress and trade effectively it would take some time to become a very good trader.