Don't worry about it, all cryptos are down, it is called a market correction and it happens to all asset markets from time to time. After prices go up high and quick lots of people start to pull out to realize their profits, other people believe that the market is overvalued and other people just get scared and run out. It is ideal to sell before the correction but if you find yourself in the middle of it it is best to hold your coins and wait for the rebound.