What Do Stiffness And Pain In The Neck?

Good Evening, Doctor: For the last two days or so, I ve awoken in the morning to stiffness and pain in my neck and back accompanied by a sore throat and swollen lymph gland on the right side only. I ve gargled warm, salt-water and have used sodium naproxen as needed for pain. I m also lethargic, and feel hot to the touch but am not running a fever. My appetite is sufficient and I ve been drinking quite a bit of water (about 1/2 gallon per day), and am trying to get as much rest as possible when not at work. As an aside, I ve had these symptoms approximately two weeks ago, but they had abated on their own.