I often lose my temper when altcoins drop sharply.
And in general, I sell altscoin at the bottom
Aint we all.
It is not easy to take it when you are looking to a coin that you have been supporting for a long time.
What else could you do?
Patience. A lot of it. That is all we have to fight back. Maybe spreading more news about how good the altcoin could be if only supported more. Then wait for the feedback in price.