I have a bad head ache, sore throat and feeling nauseous. what could it be?

Dr. can evaluate: Throat pain can be from a strep throat infection (antibiotics are needed), a cold or influenza (Tamiflu (oseltamivir) may be used for influenza), or from some other cause such as allergies or irritants. A person might see a doctor if the sore throat is very painful or doesn't go away quickly (mainly to check for strep throat and influenza). Influenza (the flu) can cause a big headache.