I often lose my temper when altcoins drop sharply.
And in general, I sell altscoin at the bottom
I feel the same way too. Its when your ready to make a trading and wanted to sell your coin because you really needed to trade but suddenly you saw those red lines on the market, it was totally sucks. But due to a reason you really needed to trade because of emergency reasons there's nothing you can do but to make a deal with those red lines. But if there's no such valid reason to trade during those red lines I swear I wouldn't take the risk.
that way I think is also better because we ourselves are very difficult in predicting when prices will rise again even though ultimately the revenue is not maximized but make it all as one of the rare experiences that can be remembered to continue to provide great motivation for us in every trading.