Thanks for your thoughts Daveman. Regarding people looking it up, someone eventually would. The nice thing about having a generic name is that it doesn't define any of your symptoms. Coming back to Crohn's disease, someone could have constipation or diarrhea, and the effected area could be anywhere in the gastrointestinal track (some areas are more embarrassing than others of course). But when someone says "Crohn's disease", you don't know which symptoms they have. All you know is that they have "issues". It would be nice to get into that camp somehow. For example, someone could look it up and still not know if your specific case is an autoimmune response to prostate fluids, semen, sperm etc. and they would figure, "Whatever the details are, they're personal."
I do understand your point about not knowing the cause. If some cases ARE caused by an autoimmune response, then those cases aren't necessarily caused directly by orgasm per se, so maybe POIS itself isn't the most accurate term.
As time goes by, I'm becoming more open about my condition and would like to use a more generic name.