I am currently undergoing treatment for this with my dentist. I grind my teeth because I'm too high strung. It stopped when I got my divorce but recently started up again. I broke 2 filings and had to have 1 tooth capped. I've never had a neck injury.

One dentist suggested that because of my severe sinus/allergies was part of the cause, he said not all of it.

I have a night guard. It is me, I do worry and don't show it, so I grind my teeth. Sometimes during they day I find myself doing it too.

You are not alone, hope you find a good solution.