How Do I Make It Stop

I'm 21. For the past 2-3 months I've been experiencing some really strange things. Strange pains and movements mostly. I decribed them to a friend and she said it sounded like my body was trying to change. She watched me go threw one of these 'fits' and said she thought I was possesed the way my body was contorting (I think thats the word she used). She said that if I am a werewolf I should just give into it. The most I remember is the pain. Like my bones are tearing away from my muscles beneath my skin, stretching it close to the point of it tearing. My muscled burn and twist. I cant focus and I end up fighting myself. I wanted to know what everyone thought. Even the people that think im some psycho poser. I may be psycho but im not making any of this up. My mom dosent know who my father is. I did go to a psychologist for anger management when I was 16. My cat who usually hates me is now sucking up so to speak. Any suggestions for making the pain stop short of killing myself would be helpful.