From the looks of it, there was a liquidation of 12bn of $ in bitcoin, that together with the announcement of a fork of bch has brought a little fud in the market, that's why the price is going down so much, and if you need advice? buy, it's a good discount and I don't think it will last in that price for a long time, so take advantage and buy.
Don't mind if I do!
It is going crazy again, it drops when everybody is looking forward for the possible Bull run, Crypto market is having some issue right now and no one can predict what had happen lately. For me it is just a market Volatility, price value goes up and goes down dependent on the volume of investment and investment shift to other market??? But i believe the correction after the market drops will follow soon. Be patient and hold on to your investment, make a market review decide if you must, protect your investment but don't Panic.