My dentist also found nothing wrong with my teeth that was causing my facial pain. It was diagnosed as "mild trigeminal neuralgia", and this was a couple of years before any thoughts of MS or any other larger problem.
I am THANKFUL that it was mild--it was bad enough--and hasn't been back.
I haven't dealt with your other problem, but hope you can quickly get to the bottom of it. (Sorry, couldn't resist

)