How do you actually deal with it? Do you wait and keep on waiting in hope that it will bounce back up and return your investment or you sell and get whatever left of your investment?
I'm keeping myself calm all the time because if with the given situation, I don't have choice but to keep on waiting for the price pump.
I don't want to deal with it seriously but when the amount involved is too high, I will find a remedy which is by keep on waiting.
The only way to stay relaxed is to constantly sell increments of your holding into strength. You might discover at a later point in time that you've sold too early but better making less profit than making a loss. To keep your emotional balance is one of the key factors in successful trading. As long as you do proper risk management by selling into strength you'll be fine.