pain in the neck

ow. i did something to my neck and it is really bothering me. i don't know if i slept on it wrong or what, but it started sunday with a mild tight/"needs to crack" feeling in the left side. now it's getting worse and worse. my range of motion is even limited. :( it feels like something is pinching back there and i'm having a hard time tilting and turning my head in either direction. if it doesn't go away soon, i'll be heading to the doctor. i think it's more than just a sore or pulled muscle since it keeps getting worse and stretching it doesn't seem to be helping. ow.