This is normal to be felt since we are just human being at all but having a self control on these kind of situation would really help you out to avoid further loss.We wont lose nothing if we dont sell out our holdings.Recovering is possible by just holding it out. Better is to stick with ones own coin and that coin should be either bitcoin or any from the top altcoins. The reason is they all are believed to recover after every dump and bitcoin is the most amazing one