facebook account hacked! plz help?

[tia]

my facebook account has been hacked for the second time in a row.
previously i changed my password of facebook and gmail which are linked together.
and like a month back i recovered my account of facebook through gmail.
now my gmail account is also hacked! please help me. there is no way left bt to lock it.
i did lock it. but there were even security questions but i didnt put that question last month.i am sure about this 101%. now please help!!
it was accessed by someone recently on 14th october.