In the future, if you start up another facebook, use back up safety measures to safeguard your account.
1st choose the settings "wheel" to the far right and select "privacy settings" on the drop down box that appears.
2nd choose "security"
There you would want to select
-"secure browsing enabled"
-"text message notifications enabled" (which means you can not log in from an unrecognized device without first typing in a code that is sent to your cell phone) if you enable this, nobody should ever be able to access your account.
-You should then fill in the "trusted contacts" section. You should select 3 people that you trust completely that can help you in the event that you are ever locked out of your account for whatever reason.