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So... this is my first post, a bit embarrassing but maybe it helps someone.
I just got my mail 'One last step to set up your account'
I go into the site, get my new password... and then I want to log in. I didn't remember my username 馃槄
(and I didn't have the first email I got)
So, if it hasn't been a long time ago there is a bot recording everything, and there is a site:
https://steemd.com/@steem
Search for something you normally use! I tried several ones...
Maybe you have to look further, go to the bottom and click on the next page, and find it!
good luck if it happened to you!