CRAZY EX BOYFRIEND TRYING TO RUIN MY SENIOR YEAR/COLLEGE LIFE?

Okay, so literally last night I broke up with my ex boyfriend who I have been dating for half a year. I just realized that I deserved better from the way he talks and treats me. Well all last night and this morning he has been threatening to send these pictures to my high school's faculty and my college coaches who just recruited me for track. There pretty bad, but i'm wearing my bra and panties in them but still! I'm so scared and worried! Everything would be ruined and my teachers or college coach would never look at me the same again and look down on me. I dont know what to do! I really dont think he's bluffing because when I got on my facebook this morning to block him, he wrote on my wall how much of a I am and how soon everybody will know the real me. I'm crying so hard just while typing this. Please can somebody help me in stopping him from threating me and soon ruining my senior year and college career.