This theory already has some backing here:https://sites.google.com/site/poiswebsite/test-page/orgasm-induced-catecholamine-imbalance-via-pituitary-dysfunction
Ive got a theory here, that might explain alot of symptoms of POIS, and why niacin/continual vitamin b complex supplmentation is working for alot of us. To make it short, POIS could be a debilitating reaction to a massive adrenaline surge during orgasm. This reaction can last for DAYS, yes days. Hyperadrenergic disrorders are different from just plain stress/anxiety, in that it really is an overload of pure adrenaline coursing through your veins that can be caused by orgasm, eating, running, etc. Many patients who have hyperadrenergic POTS, report that it can sometimes take days to recover from an adrenaline surge episode, and the symtpoms include dizziness, brain fog, muscle pain, palpitations, dry mouth, digestive problems....
And guess what vitamin b3 has been shown to be really good for??? thats right, adrenaline surges... Look at this quote, "Accordingly, they decided to use high doses of niacin, another natural methyl acceptor, to reduce the conversion rate of noradrenaline to adrenaline and then to adrenochrome. Double-blind controlled experiments conducted on acute schizophrenics with high doses of niacin (usually 3 to 6 g daily) were very successful, outperforming the then conventional treatments and reducing suicide rates.26 Niacin can lower the body's production of adrenochrome and its derivatives."-Dr. Abram Hoffer, MD, FRCP (C) and Dr. Harold D. Foster, PhD, Feel Better, Live Longer with Vitamin B-3
As to how Niacin could be specifically working for this problem: Niacin is a known methylacceptor(it grabs and steals methyl groups). Adrenaline is made from norepinephrine by the addiion of a methyl group. Therefore the niacin protection could be clocking the conversion of norepinephrine to adrenaline, protecting people from the adrenaline surge, and also probably preventing a relative defieincy in noreinephirine( a neutotransmittor heavily involved with depression, lack of concentration, brain fog, etc, if there is a lack of it).
In sum, the vast majority of us could be dealing with a hyperadrenaline episode during orgasm, which can last for days, and which would make a lot of sense as to why niacin works for up to several hours(its blocking the massive adrenaline surge). To those who are not helped by niacin/b complex.... it very well could be an allergic response, or something else entirely...OR you could have a hyperadrenaline disorder which gets triggers NOT ONLY by orgasm, but by eating, sleeeping, exercising etc, hence the constant POIS.
Just food for thought on the issue