I found this thread after realizing I had POIS. It was getting worse for me over time and now that I have a girlfriend my symptoms were really showing up.
I would feel tired/achy/grumpy for a day or two after sleeping with her, and the more we slept together the worse it got. It felt like a hangover from a really bad night of drinking.
I tried taking more vitamins, changing my sleep/exercise routines/, not watching porn anymore, etc., which all helped but never solved the problem.
Finally what worked for me was getting off of gluten. My POIS that I've had for many years vanished!
I just wanted to log in and share my experience in case it helps anybody searching for an answer. I know I got to the point where I was willing to try anything that might have helped, so here's another thing to try.
Good luck to everyone.
Thanks for sharing your experience. How long after starting your gluten-free diet did you notice an improvement in your symptoms and how long after starting the diet until you realised your symptoms had vanished completely?