If you haven't already done so then you should change your account's password e.g by tapping on it in Settings > Store on your phone and logging into it, via the Store > View Account menu option on your computer's iTunes or via http://appleid.apple.com
Foryour security questions, if you don't have access to the rescue email address on it then you will need to contact Support in your country to get the questions reset.
Contacting Apple about account security : http://support.apple.com/kb/HT5699
When they've been reset you can then use the steps on this page to change your rescue email address for potential future use : http://support.apple.com/kb/HT5620
Or, if it's available in your country, you could change to 2-step verification : http://support.apple.com/kb/HT5570