Hi Keiran,
I am Dave, I will help you with this.
Usually when a hacker changes the Email on a Microsoft Account, then that account cannot be recovered, it is lost and there is no method to recover the account.
If you have been luck enough to be able to recover your account, when the 2 day time period has lapsed, it would be best to ensure you have a very strong password on your account and enable 2 factor authentication on your account to ensure the hacker no longer can access your account.