Fever

Bed rest in a cool, well-ventilated room 

Drink plenty of fluids 

Wear light clothing 

Take a cool shower 

Take your temperature every six hours 

Take anti-fever medicines like paracetamol without exceeding the daily dosage.

Its an emergency!
If you are feeling breathless.
You also have a stiff neck.
If you have other such symptoms as coughing with blood in the sputum, severe headache, confusion and fits.