We should trust our experience in trading even though the situations got worst, and I don't think panic selling is the solution. What will happen to your future profit if you sell it all due to you're panicked? That's why we should stay stronger and keep the faith burning so we could stand against negative speculators.
Ofcourse, If we have some experience regarding about trading we must believe and trust on our experience. Eventhough sometimes you lose and your profit decreases because of tradings at the same time you also need to believe that you actually won most of the time. Your trading experience is your concrete idea or inspiration for trading. If ypu earn and did well at first, you can also do it next time.