i am a 55 yearl old female and have been sick for 3 days. Started with a terrible headache on one side, so I thought sinus infection. Flu has been going around office. Got tamiflu, but it made it worse and I started vomiting. Had a fever, chills, and treated with Motrin. Still have headache but vomiting has stoppped (have kept water down today). What is it? Sinus infeciton, migraine, flu???