My facebook and email id has been hacked

Hello,


my name is afrin binte akber .and im from bangladesh ... 4 hours ago someone changed my facebook password ... and when i try to log in it says that the email addresh ***@*** is unavailable . but in facebook account my phone number was saved but when i try to set password it onle says and unknown email id which is not mine :( there was no option to change password ny phone number :( but im sure that in my account i saved my number :( plz help