Sorry to hear that you forgot your email address. However, as far as I know, admin isn’t going to give a person an account’s email address they don’t have control over due to privacy concerns.
However, if you know your hosting account username, e.g, if0_abcdefgh, and its password, then you can log in to the control panel, remove that domain, then get FTP details from the control panel, use an FTP client to create a backup, and then create a new account, add your domain to it, and upload files.
If you don’t know your hosting account details either, then I’m afraid you are screwed.
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