You may say that it is not easy to invest when market are jumping up and down. But more experienced investor should tell you that investment markets are always jumping down and up and occasions when market stays at the same place are quite rear.
And even if stock market stays flat it is never calm. Flat situation can be even more nervous because all investors are waiting for something to happen just they don't know what to expect. Well, investing is not sure thing and many things depend on conditions that are secret for all the market participants.
Well, at least every investor can expect for the best, that bull market will come soon and stocks will maybe rise some day again, just don't loose the hope!