I often lose my temper when altcoins drop sharply.
And in general, I sell altscoin at the bottom
If the market is full of red that was the time to buy but if you are bought at the high then its red now, don't sell it if you don' want to lose because there is a comeback in legit alts but you can't rolling your money for other alts, that is the disadvantage.
I do the same, when the market full of red then I will buy more but I'll chose which coins which has the best possibility to pump again in the near future. It means we should be careful in choosing which coin to buy, otherwise it may go down again and again then it will make us get negative.