How to access your Xbox 360 account if email forgotten
If you forgot your email, kinda screwed. Do you remember the user name for the 360 account? Call customer service, ask if there is a way to bypass the email.
Go to whatever site your email was and hit the forgot password button but I hope you have a back up email
Your screwed, contact Microsoft support or if you have admin account it should have all the email addresses on it, and your smart you would have one.
If you have lost your email to your Gamertag you have no other choice but to create another account.