Well obviously op, this is something that we just cannot prevent or is totally out of our hands. We will never really be able to know what will happen tomorrow so we cannot really prevent anything bad from happening. All we can do for now is just speculate and just rely on our own instincts and hope that we will reach to a course of action that we will never regret in the future. But if I were you, I would not sell. Because of all the years that have passed, bitcoin and all the other altcoins have been going through almost the same patterns every year. Which is why I believe that sooner or later this storm will be over. Just have the mindset "price dipping? buy. Dipping again? Buy again and so on." Of course do this with due analysis. Although with bitcoins, the pattern is easy to follow, Always make sure that you invest in the right altcoins if you are an altcoin investor.

hope this puts your mind at ease. good luck.