in trading we often can not manage the emotions especially when the price down and will be detrimental for us, in that condition I will stop for a while and see whether the opportunity is still able to gain profit by holding it
Well it's irritating that you've lost so much or you've sold early and the next day the price go bloom. What I'm doing in times like this is drink a cold water and ride the bicycle or walk down the street, think some and stretch some. It's really hard to bear loss, sometimes you won't be able to sleep at night.