fernab, not giving any advice, but could you measure your 'waking up' body temperature (when you are not sick). I have found thyroid dysfunction leading to ejaculatory diseases including my own POIS. In general Niacin will work for the hyper-thyroid, while counterproductive for clinical or subclinical hypo-thyroid (under methylators).
Hi swell, I am in a permanent POIS state. My POIS symptoms are triggered in this case not for any arousal or emission. But rarely it is triggered just by putting pressure on some sensible areas of my body.
I have been checked several times the levels of my thyroid and has never shown signs of hyper or hypo (above or below).
I could measure my 'waking up' body temperature but being with this permanent POIS state... I have no other possibility.
Do you think it would be useful in this state? And also having my thyroid at normal level?.... Anyway I thank you for giving me some additional ideas. I will keep them in mind when visiting a specialist. Thank you swell. This info can also be useful for anyone reading it, to share it with his doctor before taking the niacin.