Chiropractor for jaw pain and headaches?

I have had a horrible headache for 36 days! The pain seems to be stemming from my jaw. My doctor told me to get a night gaurd to prevent any night time grinding. I used it one time and now my jaw feels like it's out of place. It's really tight and i have a hard time opening it all the way. I've been seeing a chiropractor and it seems to help a little as far as any neck pain. He keeps telling me he can fix it but it's not getting any better. I think it may be possible tmj disorder. Has anyone ever heard of a chiropractor being able to help with something like this? Or should i try the dentist?