Your question is a bit chaotic. How not, you ask without carrying the slightest evidence, at least your username or gmail stash.
or you remember the address of something for example, BTC address, ETH that you used in the past.

Quote from: Classified: Top Secret on September 17, 2019, 02:16:29 PM

Staff: can any of you guys do an email search for an account associated with my old email address?

Your question is trapping.....
How could Staff look for gmail or username if you don't know the gmail you use.
All members here have gmail or username but all are remembered except you.
Cases like this are rare, maybe in a thousand members there isn't necessarily like you have experienced.

Quote from: Classified: Top Secret on September 17, 2019, 02:16:29 PM

I just can't remember my old username

Maybe you, during this time in the hospital, and stated by the doctor you have "memory loss." can not remember the past.

I found the account name is almost the same as your current account and this account has been inactive for a long time.

1. TeamSecret
2. SecretRandom
3. TopSecret631

But I'm not sure this is yours.
Try to remember something that can be seen and searched.