http://help.yahoo.com/l/us/yahoo/edit/;_ylt=Aoz0Zi52EFq472_KIYZOX6ajoyl4 I urge you to change your PASSWORD, security questions etc and possibly your email address when recovered.
them and tell them that any change in the past hours are not made by the owner of the email, do not forget to mention them your latest password just to prove that you are the owner.