What is wrong with me?

Hi i'm a 16 year old Female and for about a week now i've not been feeling right, over the weekend i was sick and had diarrhea. i took some tablets to stop the diarrhea but now i constantly feel sick, i am always tired. I'm brusing really easily. When i wake up in the morning i feel like my head is in a vice and getting squashed also my eyes are really sore when i look about. Also one minute i am freezing and shivering the next i am roasting hot and sweating. I feel really down about it, Please someone help.