no it is not normal. influenza (assuming your diagnosis was correct) only lasts a week if you don't treat it; a few days less if you take tamiflu. tamiflu does not cure the flu. it just shortens the course. if you are still having headaches and fever you will need to see your medical provider again.
how long does it take to get rid of flu with tamiflu. my dr prescribed me tamiflu on tuesday and a week later i am still getting terrible headaches and fever around 102. is this normal?