it sounds like you have trapped or hit a nerve. I don't suggest chiro (plus they need to take Xrays before they will treat you). A physio is much more gentle. I can recommend a good one in the Greensborough area. He had me walking 24 hours after I slipped a third disc in my back.

You need to have a CT done. It sounds like you have a disc bulge. The best thing for it is rest and ICE. You will also most likely need anti-inflamatories such as voltaren. If it is really bad, it's probably a good idea to head to ED - especially as it is your neck. Being a Sat, I'd head in now before the Sat night mayhem starts.