My account has been switched with somebody elses

I was just logging in today and my name was changed to iJitter_ after beeing pixelguy04 for almost five years. i've lost all my progress om most servers and my inventory was wiped allmost everywhere exept for my personal Worlds.

I didn't change the name myself and i dont fancy waiting a month to change it back.

here is my profile https://sv.namemc.com/search?q=pixelguy04