Sending, receiving, and organizing email in Outlook.com
Sorry to hear you're having trouble.
Although I do wish there was something more I could offer to help you with here I'm afraid that completing the form is the only option you have to try and regain access to your account. This is because neither anyone here nor Microsoft Support is able to help with account recovery.
I would recommend writing down the answers that you're supplying to the form and then change them as necessary on the next attempt. The form is designed to help you remember information you may have forgotten so this will help.