There is only one server we all play on.
Did he change your fb login maybe?
Your game is most likely connected to your fb so that might have happened.
If its not connected to fb, use this link to send support ticket to restore your account and then connect it to your fb:
Also make sure you write your ign and ID for them.If you dont remember your ID, ign + your level will do.
Btw welcome to the forum!