No matter how good the fundamentals of the coin are, if a coin goes more than 100% within 24 hours I absolutely sell them. A classic case of this has been Storm coin, it has already dipped about 50% from its ath after it went crazy just a couple of days ago.
You are very lucky to hold this coin. On topic, I always plan everything in advance and hold to that plan no matter what. This method is easiest to eliminate the frequency of failures.