Stay calm. This has been done before. Keep in mind that the Mt. Gox days was simular. It might go down to $2,000/Bitcoin but any buys that are lower than $10K is a good buy in the long term. It will bounce back up and beyond. Just buy and hold.

Keep in mind that the Dot Com was much bigger than Cryptos. If Cryptos are going to take over the world. We have a long way to go.

Here is a chart comparision of the Dot Com bubble in 2000 and the current Crypto market.
https://www.reddit.com/r/CryptoCurrency/comments/7irww4/bitcoin_bubble_vs_dotcom_bubble_market_cap/