Health question.Please answer me!?

i've been sick for 3 days now. i have very high fever.when i try to eat something i throw up and food disgusts me even though im hungry so i dont eat. i have extreme thirst and frequent urination. also a pain on the left side of my back.also nausea big headeches and diarreha.also dry cough and runy nose. i get cold alot and my body shakes alot for about 30 mins until i fall asleep. please help i dont know what to do.