I have hurt my neck and need advice on how to soothe the pain...Please Help!?

I tried to crack my neck the other day as I do all the time and have never had a problem...and now I have severly hurt my neck....I can't move my neck to the left side at all and I also can't have my head up straight...It hurts sooo bad and I was just wondering if anyone knew how to get rid of the pain?..or even tell me what I did to my neck...any advice would be greatly appreciated..thanks!