Nighttime fevers ? Not going away. It's been 4 days. ?!

Hi. I'm 19 years old. No I don't smoke. And no I normally am not sick like this. I'm normally a very healthy girl with nothing more than a cold. So anyways. On Friday, I had a really bad cough, which was irritating my throat. On saturday, my cough worsened. So I started taking theraflu for it. From then on, I have been taking theraflu as directed. But starting on Saturday, I would get fevers at night and they would break by midnight. Sunday and Monday rolled by, on Sunday, my sinuses were beginning to clog up. And I ended up with a sinus infection. Today is Thursday. I missed school yesterday because of my nighttime fevers and I was generally feeling achy. Since my condition was worsening, I didn't take any chance and I went to the doctor. I told him all of this. He told me that i have rhinosinusitis. He gave me z PAC and sent me on my way. I took my first dosage last night and my fever did not break still. And I need it to break in 2 hours or less because I have exams coming up at school. My question is, what can I do to get better? Please , I'm a 19 year old girl in high school looking for ways to get better so I can go back to school.