Looks familiar? Especially Delirium?
And apparently, transient VBI might be caused, among other reasons, by hypertrophic musculature.
https://www.annalsofvascularsurgery.com/article/S0890-5096(13)00571-2/fulltext
Also Bow Hunter’s syndrome etc.
So to me, it all starts making sense. Straight neck and IJV compression also can be accompanied by VBI.
Together, they may cause not only IIH headaches/brain fog/tinnitus etc, but also VBI-related effects, that also are similar and may overlap/amplify them. Therefore even after restoring perfect IJV outflow, there still may be insufficient in-flow to the posterior part of the brain to fully resolve brainfog, tinnitus, cognitive, and some other issues