Donniedarko,
Hello,
My daughter has many of your same symptoms that you describe and a few more. But just this year she was tested at UCSF (vestibular workup) and it ends up that the fall she took to the back of her head triggered a migraine gene that she must be carrying. The vestibular workup showed that she has migraines called migrainous vertigo (this is not vestibular migraines as many people think of them as the same type of headache) The migraine doctor thinks that she can get a lot better if we can find a drug to stop this type of migraine. He thinks it's about 70% migraine and 30% PCS. So for what it is worth ....maybe this is something to look into.

I am not always on this blog so feel free to message me-I think they go to my email?

My best,