Trust me there are someways to do that, one of them is asking this guy [if he was a hacker and none of your friends who can somehow know your password] by sending him an e-mail to return your e-mail back to you. Explain to him/her how much important this e-mail to you and let god be with you. He/She might give it back to you hopefully. You don't know any of your secret question or the answer to that one? I mean when you created your yahoo account the first time?