Hi,
Based on your description, it’s possible that your account was compromised and the hacker changed and then removed your original email address to completely take over the account.
I really wanted to bring you good news, but honestly, if the hacker changes your email address and other information, recovering your account can be challenging, and it may be permanently lost. I understand that this is a difficult situation. You can check the Microsoft article below to see if it can help.
The link provides comprehensive steps to recover a hacked account and also gives you the option to chat with Microsoft Support as a last resort.