When Bitcoin starts dropping it can last for a while (even if it seems that it's going back up). Around the end of this post it began going up, but I have some reserve BTC for sells later! Here is a good way to deal with a downward trend:
It's almost like setting annuities, but then only sell when it's at least a few hundred dollars over the max buy (so you make a good amount). Even if a trade only gets you .0005 BTC that is about 4-5 dollars, but 4-5 dollars could be worth 40-50 dollars in the long run! About 6 months ago .01 BTC was worth 17, now it's worth 98. Think about it!