victimisation/cyberbulling in international school

Hi i really hope somebody can help.I am an english female teaching in an internatioinal school in egypt.my problem is there is a man(parent) who has financial issues with the school and as a result has started a facebook page to tarnish the school reputation,which i know he is entitled to do but the problem is he has become obsessed with me in it.All the man writes about is me x came to school, was absent today was late my husband is egyptian he writes about our relationship him been muslim and i christian.I had a miscarriage he somehow found out and decided to post all about this.my bebopage(same as facebook)is private yet he has copied comments to my friends and family that i wrote takingthem out of context and is sending them to all parents trying to tarnish my reputatioin etc.I do not teach any of his children.this is causing serious problems for me at work with management and colleagues aswell.i need advice as what i can do please