Confront your assailant. This often helps regain the control you may feel you've lost. This may mean writing an angry letter that you do not mail, or it may mean going to court. Unfortunately, the court system's judgment may not be very satisfying. Try the civil court rather than the criminal court.
Civil court is more likely to decide in the victim's favor.
Consider suing a third party, such as the company, organization or group that failed to provide adequate security, for pain and suffering damages and for the cost of therapy. Remember you are not alone. Acquaintance assault is far too common in dating and cohabitation situations. Nationally, it happens to one in four women. Your local rape crisis center, hospital, attorney or therapist can put you in touch with a peer group.