A real jaw-dropper

So I'm at work today, just working along, when my right jaw starts to hurt. It gets to where it really hurts to open my mouth (insert sarcastic comment here). Now I'm home and the pain is worse. I can hardly chew anything. Mind you, as usual, there was no trauma of any kind. Nobody hit me, I didn't fall or run into a door, nothing. I tell a co-worker about it, he says, "heart attack", but I'm having no other symptoms like chest pain, shortness of breath, etc.

I'm home now, so I take a look at WebMD, where the only thing I can find is something called Temporomandibular disorders (TMD), so I'm going to follow the recommendations found there, starting with ice, which I am doing now. We will see what happens.