Thanks to both of you for your advice, I really appreciate it.

I'm going to look into the possibility that this may be related to my upper neck; I was thrown into the ceiling of the car and then back down into the seat so it makes sense that my neck would be involved.

That being said, I don't want to close the door to the possibility that it is a head problem either.

I'll speak with my physiotherapist today and have him take a closer look.

I'll also speak with my family doctor and ask her advice in how to otherwise pursue this.

If problems with my upper neck (either bone, muscular, soft tissue, etc.) don't show on MRIs etc., how would one determine that the problem is actually in my upper neck? Could a specialist actually feel such problems through palpation and visual examination? Or would they determine it as per success of treatment (i.e., if minor adjustments & neck exercises help, they follow the hypothesis that it is in my neck?).

Thanks so much for your help, I really appreciate it; I hope your difficulties get better too.