When I have had symptoms that you described, I have had a viral infection, which has been Strep
Throat both times for me. I get
pain in my
neck when I get this,
and it feels like you are getting a cold, but then it doesn't go away. Go to your doctor, or the hospital, chances are that you have a viral infection and need antibiotics. Keep up with the fluids, keep away from milk or ice cream, anything thick like that will get stuck in your throat with the phlegm. Good luck with your recovery!