Lost old account after completing registration with google.

Hello Everyone, I was using the IMDB app in my phone for several years now. I believe the first time I registered I used the "register through FB", that now is not available anymore, but I was always logged in and I cumulated a lot of votes, created lists and watchlist... so I put a lot of time on this account. Yesterday I wanted to modify something on my setting but, although logged in, the app asked me to re-insert the login data to access the private area of my profile. Since Fb was not allowed anymore I proceeded with Google, only to discover at the end of the process that I basically created a new account. All that I did in the past, was gone. That horrible feeling. I want to know if there's possibility to merge the profile or to recover the old one. I remember partially my username (it was a mix of characters and random numbers). It was connected to Fb so no email was associated with it. I hope that someone can help me with that Thank you for taking the time to read this