I understand your feelings about your exam on Friday. Those exams are not easy for anyone, but when you add what you went through with the sexual assaults, it makes it all the more difficult.
It's good your doctor knows your history. That helps. Is there anyone else you can take with you, maybe a female relative or friend? Sometimes that extra support can make you feel less anxious.
Also, keep reminding yourself that you are allowed to stop the exam anytime you feel overwhelmed by it. You are the patient here and therefore you are in charge. It is your body and you have the final say so.
You can also try to distract yourself as much as you can. Bring an MP3 player with you that has soothing music on it. If you have an IPOD, watch a comedy skit. Count in your mind or think of floating on a cloud. Whatever works for you. The more distracted you are, the faster the exam will go.
You also mentioned seeing your boyfriend this weekend and being fearful of intimacy. It helps to remember you are in charge here as well. You can always stop any attempt he makes at intimacy. He will understand, especially since he knows what you went through. Practice with him if it makes you feel better. Have him touch you on the arm then say stop. See what he does and how he reacts. Then have him touch you on the shoulder and do the same thing. Keep going until you feel more comfortable with his touch. It will help you build trust with him when you feel you have more control.
Risperdal is a medication that is prescribed to help with mood disorders or symptoms related to schizophrenia. It works by changing the brain chemistry to help the person feel better.
Taking this medication on the lowest possible dose should be just enough to help you. As long as you are monitored closely and don't show any severe side effects, you should be fine.