Hi, my son is 13, yesterday he started complaining about a headache , it got worse throughout the day, he then started complaining that his back was really aching and he couldnt get comfortable, i gave him nurofen as he was feverish, about an hour later he vomited, he said he felt a little better so he has a small amount of dinner, he had a good sleep but doesnt feel much better but now his face is quite red, as though hes very hot