Probably just a cold, although if your skin is aching and tender it could be flu. If you start vomiting then we're thinking gastric flu
Whatevet it is 90% likely it's a virus in which case the doctor can do nothing since viruses aren't alive! Drink fluids, sleep as much as possible (the more stressed and tired you are the more it'll beat you down so get some time off school now rather than trying to soldier on and dying in ur exams!!) take Echinacea tablets and Vitamin C, if you can bear the temperature then stay away from paracetamol - although taking it will make you more comfortable, the temeprature is your body's way of fighting it (raised temp = more effective enzymes!!)
Sleep tight