Do you mean you have enabled TDE for 5 databases and you have not taken a backup of the certificate created? Then good luck Not sure if someone knows a way...
No, you're never too old to Yak'n'Roll if you're too young to die.
Do you have Backup of Master Database after you configured TDE? If yes, then restore Master on some other instance to make it work & you can also export the cert again and import here.
You can also replace Master on the same instance if you're sure there were no Logins created after that or there were no server level changes.
This should help you... otherwise, Contact Microsoft.