Stupid Facebook

Last night around 11:00 PM, I took a break from the computer left Facebook open as I usually do and went downstairs for some ice cream. Came back to my room and noticed that my screen said that my log in expired. Went to log back in and the screen said my account had been disabled due to violations with their code of conduct. I did no such thing. Why was my account disabled? There goes all my contacts and photos. I don't know what to do.