No need to worry, price decreases like this every now and then are expected by now. Since the resistance at $20K was too strong, the price the price couldn't go up through the threshold and had to correct itself. I'm sure it will pick back up in a few days.
Yup! Corrections always occur when the certain ceiling had reach and I think that the $18,000 was it that is why it is already crumbling down, But we can see that there is a resistance going on right now but it will sure make a bullish trend when the correction had finish, that is why it is good to take this opportunity and buy for bitcoin when it is still cheap.