Early hours of monday morning **th Oct ****, I realised I couldn't log into my facebook...

Early hours of monday morning **th Oct ****, I realised I couldn't log into my facebook account. In trying to check my password, I noticed my Email address has been changed, my phone number was not working also. At that point I remembered what happened on Sunday evening. I recieved a call from a guy on Sunday, **th Oct **** by **:**pm. The caller claimed to be a member of a whatsapp group I also belong and told me there will be an online meeting by *pm and everyone who is to join requires a code to do so. I was told my code has been sent to my phone, let me confirm it. I mentioned it mmediately without even checking, I was very busy at the time. I did not take him seriously when he called back later and asked for my whatsapp verification code so they can generate the whatsapp meeting code that the one for facebook has been generated. I told him I wont give it to him that it was my personal information. At that point I ended the call and decided I won't bother about any meeting. I immediately checked my phone and discovered that in confirming my meeting code to the caller, I read out my facebook password reset code and security code. I have tried everything, and it takes me back to my Email which has been changed..my facebook contacts have contacted me that they are receiving messages from me. The hacker is trying to defraud my contacts. My facebook name is : Anietie Chris Ndiomu. Also the E-mail address above was connected to my facebook account before the hacker changed it..Please I need help ASAP, I know I was careless but I have learned the hard way. I need my facebook account back. Thank you....