You can not panic. Panic can lead to very unpleasant consequences, when carelessly to sell its assets at an unfavorable price. By investing should be approached wisely.
Agree that you do not need to be panic in your investment because this is not healthy if you do panic selling it will result to depression if the price would go back higher but you sell it in lower price. Much better to set a time for your investment and price if the price reach it already that's the right time to sell.