For those who are interested in a dental report, here it is.
The black I saw is from the metal at the base of my crown (nobody told me and it never occurred to me).
After doing a bunch of different little tests and checking things out, he says I must be clenching excessively (I've had problems with excessive clenching and grinding over the years - but this pain is much worse than anything I've experienced before - I am particularly surprised by the ear pain that I am experiencing). I've tried mouth guards and don't tolerate them well.
I will have to see if I can come up with some ways to prevent or hinder this very bad habit of mine.
I will definitely need to get this under control - an aching jaw, neck, and ear make for a very irritable Mommy.