Getting panic can give you nothing but a lot of suffering which can result in huge amount of loss. Ups and downs are the part of every business. So you need to prepare yourself so that you can decide well at such kind of time. You need to remain patient and control your nerves. Only then you can save your money from being drowned.
Even in the real sense, panicking will only make you to end up doing things you won't have done if you had taken your time to think well, strategize and make the best decision.
Panic has never solved any problem in the past and neither will it solve any in the future and it is left for anyone to understand first what they are doing before getting into it as to be enlighten them on the quality decision they need to make in case they are seeing some certain changes.