Help me,I can t control myself

Hi! It s about a person...a girl. Well,I know her ,she knows me. If you strongly believe that I like her(because that s the main thought that will cross your mind after you have read the first line )) ),sorry to dissappoint you. It s not love,I really disconsider her person and character. Ok,I hope this introduction will help you to introduce into my problem. Well,there is a voice in my mind and after some time I feel that I can t control it anymore. It tells me that I have to hurt that girl. I m not a coward,I m not gonna hurt a girl,but that voice is so strong. I can t control it...It says: 'Hurt her! Rape her! Make her feel bad!'. At the moment,I haven t done that,but I don t think I can abstain anymore. Hours per day that voice make me think about her...and a couple of days ago I saw her. She was in front of mine,just 50 metres forward. That was the first time when I was on the point of hurting her. Please help me! I don t want to do that,despide the fact that I really hate her. Help me! I forgot to tell you some important details: she made me a lot of harm and probably that s one of the reasons that give power to that voice.