Find Friends Icon Disappeared on Facebook Can't Do Search Either?

[Lily]

Have no idea what happened, all of my icons rearranged to the Right side from the Left and the Find Friends icon is disappeared along with the white space ~search window~ which supposed to be in the middle. It was fine in the evening, and it wasn't working on the next day. I'm not able to search for anything! It is not hidden anywhere, I went thoroughly back and forth a thousand times.
What happened? No one else used my computer . It has the same problem with Safari, Firefox, Googlechrom etc. My other -not related - FB account just works fine.
Do you think this account was hacked? I had no problem to log in. What should I do to correct this really annoying problem.

Thank you for your time!