When the price (market)[of Bitcoin and some altcoins] falls it is not treated as loss on a real investor, they treat it as an opportunity to buy more at a lower price. You only loss your money if you sold your coins when it drops in price. So why panic sell when your profit turns to negative? The best way to deal with it is to continue holding your bitcoins and wait for it to rise again. Take note, the only way forward [for bitcoin] is up.