My 13 year old daughter has been sick for over a week with fever, severe headaches, and joint pain. Took her to doctor last Friday and they tested her for flu. That was negative. Her white cell count was high though so they think it is another virus. She also went to the dentist prior to getting sick. The joint pain keeps moving around, knees, wrists, elbows. Painful headaches and some nausea, but no throwing up. Help