I remember cryptocurrency in December 2017, could make heart attacks, high levels of panic and stress
01. Most Painful

I accidentally deleted the private key and password to enter the blockchain.info wallet after 1 month I completely forgot the email address listed on blockchain.info,

02. Happiest

I got lots of new friends in the Cryptocurrecy business and was happy to see bitcoin prices increasing in 2017 but in January 2018 it was very painful.