Hi sisyphus, I'm happy to answer your questions:
I don't think the dose of magnesium is enough to be considered a megadose. The company that manufactures the supplement I purchased recommends taking one scoop, equivalent to 425 mg. Magnesium is fundamental in the process of thiamine activation, so much so that people who are deficient in one are also deficient in the other.
Yes, I have had anal itching for 5 years now, when I started suffering from all these problems. The only thing that has eased it so far is the benfotiamine. It's possible that the anal itching is a symptom of seborrheic dermatitis, which I no longer have on my scalp since I took the supplements, but I don't understand if it went away thanks to the B vitamins or the zinc...
During the 110 days of abstinence I had slight improvements in self-esteem and social skills, but I still had brain fog, runny nose, digestive problems, cold intolerance, pots, shortness of breath etc.
My POIS was unfortunately only greatly aggravated by an orgasm, but I suffered from any activity involving a large involvement of the autonomic nervous system, such as high intensity physical activity, stressful events and even showering.
I also wasn't able to handle the insulin spikes every time I ate a high-carb meal.
During the 110 days, however, the actual POIS returned every time I had a wet dream, so approximately every 12/14 days.