This is a first.
Last night I went to a fundraising event with loud speakers and a loud crowd. It was pretty hard on me especially because my SFN has spread more into my face, ears, and forehead.
I left because I felt dizzy and my shoulders and neck started spasming. It kept on and then when I tried to fall asleep, the room started spinning. I was sick to my stomach and my eyes couldnt stop following the spin. It was pretty disturbing.
I am used to the autonomic problems and orthostatic hypotension, but this was a first.
It lasted about 3 hours.
I think this thing is moving along in its attack strategy.

Sounds like vertigo.

I get bouts of vertigo on an almost daily basis since a concussion years ago. Some days not so bad. Other days debilitating. [I do not have PN though.]
Your description sounds just like how I experience it.

http://vestibular.org/node/2
http://vestibular.org/autoimmune-inner-ear-disease-aied

I have SFN symptoms in my face, back of head and ear. Sometimes loud places make me dizzy and my left ear pulsates. Small, loud restaurants with lots of talking are the worst. You have to wonder if your situation is autonomic or if SFN is impacting your vestibular system.

If you have fluid behind the ear drum due to allergy
Or chronic infection or blocked eustachian tubes.
The pressure will stimulate the nerves in the drum
Membrane and cause a vertigo.

You can also have a virus inflammation of the auditory
Nerve. Sinus pressure can also cause dizziness.

All that neck pain.. Did you ever go to an ENT for that?