Massive fear for bitcoin cash fork, so it seems.
Probably after tomorrow market will start to recover, depends on how the fork turns out.
lol, imo nobody in his right mind cares much about the BCH and "SV"* fork crap going on right now.
So, relax, and enjoy a typical crypto-rollercoaster ride, that will ultimately turn to the upside, because that's imho the only way BTC can go longterm.
*what a joke of a name, the real Satoshi (he, she, they) would probably want to puke in Craig Wrights face when they first heard his announcement to call his shitcoin Satoshi's Vision.