Why is there something to worry about? I would worry about the fact that it increased by 3000 $ in a few hours a few days ago. This is quite normal and will even drop if we see the price 4x lower. The sometimes volatile spike and then very quickly makes me more nervous than the fact that it fell by 1000 $ somewhere. Also remember that Rise does not exist without Fall .... Bitcoin has its ups and downs but generally nothing to worry about because its price goes up in the long run. I bet at this time next week it will not only recover but also achieve a new all time high. Obviously the price has reached the resistance and therefore the pullback and drop of $ 1000 while it is around $ 16K + this is a regular occurrence in the possible trading after a pullback or this price correction will break the resistance and push up to $ 20,000 in the next few days.