Screwed my neck up

A new guy showed up at Jiu Jitsu class.  He was pretty strong but had no idea what he was doing.  I was just trying to roll lightly,but somehow he ended up driving his shoulder into my face.  I felt the tip of my nose touch my forehead and blood started gushing a second later.  I thought that was the worst of it, but then I got really light headed and my neck started to hurt.

An hour later my neck was starting to lock up completely.  I woke up this morning very stiff, felt dehydrated.

I'm mainly pissed I may not be able to lift today.  Hopefully my neck will loosen up.