Are you saying it lets you log-in on the forums, but not on the client?
Or are you saying you're on an alt account because your main one won't login?
If it's case number 1: It's due to special characters in your password such as: :@;'[]"£$%$^
You don't need access to your e-mail to change your password VIA the forums, just your current attached e-mail and password and you can change it in the control panel.