I agree, I actually wear a Philadelphia Collar 24/7 and have done since 2007. It does make a BIG difference to the night-time pain levels and disturbances and you’re right it does keep the head ‘in a good position’ in relationship to the neck, helping with the CSF flow and I’m sure that’s what brings on the immediate improvements.
I had tried soft collars, which held my neck firm but not my head. I still had too much freedom of movement of my head but there again, I have instability following a bad head and neck injury, causing ligament damage at the craniocervical junction.
Thanks for the advice on Atarax, I’ll consider that if the Diamox is not effective (or suitable). I have constant tinnitus, so even if it just get’s rid of that I’ll be pleased.