Hey @Merdecai, welcome to the community!
Sorry to hear you've lost the credentials to log into your Premium account.
Right now, if you don't have access to the email address linked to the account there's no way to reset it.
In this case, the best thing to do is to contact our Support team via Twitter or Facebook. They'll be able to track down the account to help you out.
All the best.
“Music acts like a magic key, to which the most tightly closed heart opens.”
― Maria Augusta von Trapp