I have a sore throat, chest pain, headache, dry cough, and pain behind my ear. What could this be?

Cold? Flu? These symptoms are typical for a common cold with bronchitis, or perhaps influenza (except it's the wrong time of year for the flu). If you have fever or otherwise concerned, or if the symptoms don't clear up in a few days, or if you just remain concerned, see a doctor. Good luck!