my account is locked - why? Help!

[missbopeep]

Why am I getting a message that my account is locked and that I am trying to log in from another device? I'm not! Does this mean someone has tried to hack my account?

When I go through the 'security checks' on FB it's not working- I type the squiggly letters in the box then it asks me to identify friends from pics but I am unable to choose that option as their message says 'hourly limit exceeded'. (which it's not as I've been out all day and not on pc.)

help- what can I do!