Maybe check your Email here
https://haveibeenpwned.com/ that shows you if your email got compromised !
Also if the Hacker got access to your email and just wanted your account its easy to change just the email on the account .
Hope you already have changed your email login.
Also try to remember what sites have you used the last days or have you installed some software or wallet the last days .
Its possible that there was an Software that stole your login .
I check
https://haveibeenpwned.com/ my e-mail
andreybudbt@mail.ru "Good news no pwnage found!
No breached accounts and no pastes (subscribe to search sensitive breaches)"
I have now access to my original e-mail
andreybudbt@mail.ru Hacker already changed e-mail and password for account AndrewBud, but I still have access to my original e-mail.. I do not understand HOW HE CHANGE E-MAIL....