[posthiatal1]

I don't agree with the OP's interpretation of the organic causes, but:

The PTSD seems quite plausible, as either a consequence of the original phenomenon or, yes, even a factor in it.

For an organic component, if any, I prefer hypoperfusion & ischemia.

I wonder if circulation can be impaired by chronic high levels of stress (and the inflammation caused by stress).

If so, I wonder if this can happen selectively, affecting most strongly the areas used most intensively during stressful times (and receiving the most exposure to high-cortisol blood).

I wonder if narcolepsy and/or something like this may work to protect the brain (from whatever mechanisms) during periods of high stress.

If ketogenic diet helps with narcolepsy, I wonder if one mechanism is that burning glucose is a source of oxidative stress...