No Admins Left on a Page

We created a facebook page for our small business. We then added two admins to the page after a while one admin removed herself from the page accidentally. We thought we can access facebook from other account. but it seems like we have forgotten the password for that account. We tried to recover email address but we also did not have password for the email account. Now we are really worried because the page represents our brand. Since I was responsible for managing that other account. I am afraid I will get fired if I don't figure out a way to recover access to the account.

Can some one please tell me how we can gain access to our page again? please....