I am thinking right now, that hormonal imbalance could be the root cause for POIS. And that this hormonal imbalance, as a possible consequence....may afect indirectly nervous and inmune systems....causing a lot of different symptoms and problems....and of course, not being exactly the same for each Poiser...
The reason for thinking about this is because I am strongly suspecting that what caused me the hormonal imbalance was the fact that I was taking finasteride for 2 years ... and shortly after letting it, I started to notice problems that I never had before .... I was always someone healthy and athletic ......
And also, I see that some Poisers treating themselves hormonally (with TRT) find relief ... (as is your own case Demo) ....
Of course this is just an hypothesis that I'm thinking right now.... but that I know I have to try to talk to a good endocrine!
As I am also reading that there is a Syndrome called PFS (Post Finasteride Syndrome).... That is able to cause nervous system damages and inmune systems Disorders..... That being said by an neuroendocrinologist from the University of Milano (Roberto Melcangi, PhD, Head of Neuroendocrinology, Department of Pharmacological and Biomolecular Sciences
University of Milano from Italy....).