This may sound weird, but you MAY be reacting to the shot which I ASSUME you had when you had the deep filling. The tissue that got the shot could still be spasming and perhaps somewhat inflamed from that shot(s). I've often gotten pain in the area you've described after dental work, and it lasted awhile, but certainly not as long as YOU have had it. But I have heard of stranger things happening.

I just can't think of what else it could be!! You've had all the proper tests run, and everything has come up negative -- which is GOOD! I'm hoping this will just go away on it's own, but I know it's nasty while it's going on.

I wish I could think of what else it could be, but I just can't. Please keep us informed on your progress. Hopefully it will fade away. God bless and please take care. Hugs, Lee