What could be wrong with me?

I have had a build up of Phlegm in my throat for almost 2 weeks. i have been experiencing headaches, earaches and my neck and under my jaw has been really sore. I have been having coughing fits which gets some of the phlegm up but doesnt matter how much comes out it still seems to be there. I have been drinking lots of water and keep hydrated so the headache doesn't get worse. Any ideas on what could be wrong with me.