Cant play on my old Account

Hello, i created a new account, because i forgot my old Account. But I just remembered my old Account. I can login in my old Account now, but i dont know the E-Mail anymore for the authentication. If i want to login in one of my characters, they say "login failed" There is also no more names on the Characters. It was I think like 3 years ago, when i last logged in. Can you help me with restoring maybe the account? I also have some informations, only me as the Account owner knows. Like services on my one character. If u need the informations please write me.
Thank you in advance :)