What I usually do if prices are falling most specially if the coins are very low, I would buy more coins from a much lower price and your total amount of couns would then be divided; the result would be lesser losses. Read or research on google about books or ebooks on trading.
Me too, i will take the opportunity to buy more coins that i know can be longer on the market and hold until the value pumps again. So in that case, in the future my coins have a great profit and my losses will be lessen.