a pinched nerve, maybe?

ok, who has ever had a pinched nerve? what does it feel like? I woke up last Tuesday morning with my neck and shoulders KILLING me! It was like I had slept wrong and had a crick in my neck. Except it never went away and only got worse. Then, Friday it started going away on one side. Great I thought. Nope...it went over to the other side! What the heck? So, I have an appointment today to see what's wrong. It's not so bad this morning, but if I move it just right, OUCH!