I was like this about a month ago. every now and then I get like a cramp in my neck and pull the muscle suddenly, it kills but last time I didnt quite do the whole caboodle and somehow trapped the nerve, Basically all I could do was put some deep heat on to sooth the pain and wear a scarf and let it go away on its own.
Heat therapy and anti inflammatory painkillers such as ibuprofen. Try and keep moving your head though as your neck will stiffen up if you don't and will feel much worse in the long run. I hope you feel better soon...........and happy birthday :)