You can contact Facebook and, if you can prove you are the legal owner of the account, they might reset the password and allow you to access the account again.
Otherwise, you probably need to just start a new account and do all you can to keep it safe.
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Go to Facebook and report that it was hacked and ask them if it can be opened again or what you need to do to open the account. You may not be able to open the account as Facebook may delete it if they find it has been hacked.
Change your password
If your Facebook profile gets hacked ask your 10 friends to report it. Once the reporting is done Facebook reviews the report and suspend the profile from their database.
messages come up from 'you' saying stuff that you know you didn't type.
If you are unable to log into your account and you are sure that you are using the correct user name and password, your account may have been hacked.