Extremely Swollen Gland, or what?

Okay, I woke up this morning and went to scratch my neck, there was a huge knot where my left gland is, its sort of sore, and its freaking me out. I know what a swollen gland feels like, but this is different, its HUGE, you can see it, not just feel it, which is new, my right side is completely normal, and I have no sore throat or sinus drainage or anything at the moment, can someone tell me whats going on?