I'd start with the physio myself but most chiro's that I've seen lately usually seem to offer a lot of the same treatments.
A good friend of mine is a chiropractor. He's told me he tells his patients to give him three visits. If they don't see a noticeable improvement then they should seek help elsewhere.
I read a book once about the origins of chiropractic and it wasn't too convincing. Having said that every time I've walked out of a chiropractic office I've felt better...Placebo effect?...Who knows. Oh and yes, after reading that book I wouldn't let them near my neck.
Sometimes nothing beats a good massage...