Question: Right after the event, I felt shocked and depressed. I've been engaging in stocks for about a year now but I've never encountered such a big jump in such a short time. What I'm planning to do is just wait for it to rise again, which I'm not sure when. (Well, who is?)

**What should my mindset be?** 

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I understand that there are already lots of questions regarding **When should I sell?** or **Should I set a stop loss?** For me, this question is not 100% about how to protect your money, but it's more of **In extreme cases like this, how should I mentally prepare myself?**

I anticipate that there will be comments/answers like "we can't give advice if we don't know the exact stock in topic" or somewhere along those lines. I want to pre-emptively tackle this and say that this question is not only for my specific current case. I'd prefer answers to be generic for everyone facing the same problem.

Answer: 
Try to value the stock as is. If you assume it will bounce back, you're currently not thinking clearly. The new price is what it is, and it will go up or down from here.

If you're quite sure that the price will go up, buy, if you're quite sure that the price will go down, sell, as usual.

If you find that you are unable to objectively value the stock, sell it off. By closing the position you will not necessarily get the best possible price. But by removing a stressful distraction you will significantly reduce the risk of making some expensive mistakes in the near future.
If you own the stock today, it doesn't matter what it traded for yesterday. If XYZ is trading for $40 and you own it, ask yourself if it's worth buying today for $40. If it isn't, you may want to consider selling it and buying something that *is* worth $40.