If you provided yourself with the backup capability of questions and answers and if the hacker was so careless as to not change them (highly unlikely), then you can activate the questions and if they're your questions and your answers agree with the ones which you originally entered, you can go that route. Since Facebook and Zuchenberg (the so-called originator of Facebook - he really stole it and settled out of court for $200,000.000 with the guys who wrote the code that he stole - are paranoid about security due to many break-ins that's about your only choice. If you have a second email account and everybody should have two at an absolute minimum then open a new account.