I'm feeling really sorry. I know merely words can't console you but let it take this way. If a maniac animal bite you, will you harm yourself in return or will go for a treatment? Similarly you hadn't any control on what that sick-minded person did to you but you have control on yourself. You are important for others. Don't think of harming yourself because of someone else's wrong doing.
Your pregnency test was negative so don't worry about it. You need someone with whom you can share your feelings and who can emotionally support you. See who he could be. Your any reliable friend or a therapist.
Wish you good luck!