In theory, everyone agrees that we must master emotions and make rational and logical decisions.
Unfortunately, in the moment of the action, the emotions take the upper hand, and... bye bye logic!
That's the reason you have to practice more and try to face the FUD, loss anytime. You don't have enough brave to face a huge loss if you didn't prepare which thing you should to do in that time. Example me, every day, I tried to imagine the situation I lose all money, then I continue to imagine how I continue to keep my life with this situation. As long as I can still alive, I can continue to working and recover that amount.