Is it common to be very sick at age 15 in US ? if yes why ?!
Question: your just having a bad day. don't worry about it
Answers: your just having a bad day. don't worry about it
Not common
Well the US has nothing to do with your health. There is a flu bug going around. I would just have your parents take you to the doctor if you start feeling worse, like fever, cough, etc.... You might have a infection? I don't know? Drink lots of water and stay inside. Good Luck.