All I can say is I had the same thing over Christmas break. One morning it was really bad. I woke up kind of half way really early and tried to roll over, almost passed out from pain! I got up and realized I couldn't relax my shoulders or move my head at all. I had to keep my shoulders up by my ears and my head still for it to feel bearable. Luckily as I moved around it started to ease up and eventually I had almost full motion and just a gnawing, nagging pain that I could live with. It was very uncomfortable but bearable and hung around nearly a week before it was totally gone. I still fear it will come back! Never figured out what it was, I was afraid it was from letting my husband stand on my back to crack it (I know, dumb move) but we have since ceased that. I miss it, though. It's like and addiction, lol.
I never went to the chiro. I don't "do" chiros. lol