cant acces xbox live

my gamer tag is (removed for security purposes) and the email i used for this account is *** Email address is removed for privacy *** it say there is a error when tring to sign in to xbox live so i follow the advice and go to my email account when i sign in it say something like somone else may be using your account and you need to verify that it is you. The problem is i dont remember the password to the other email adress i used for the account because it is old and i dont remember alot of the details for my account to fill out the verification form like date of birth and who have you sent email to.