I see. It is possible that your Minecraft license and progress is on the other account then if it is not showing up on the one you have access to. But since you are seeing a different email address, it could mean the hacker has changed everything making it not accessible anymore.
I suggest you still go through the Microsoft account guide that I have sent to have the Microsoft team help you in recovering your account. If you will follow the prompt you should reach a form https://aka.ms/recovermyaccount and you should get an email response within 4 hours the latest. The team on the other end will help work through the issue with you.
Note: The form is hosted on the Xbox support site but is available to all Microsoft account holders not just those who use Xbox.