Hi Daysleeper,
POIS is very complicated, and as I have already suggested, I think that at some point, we develop secondary emotional problems from long term POIS. Some develop a chronic depression secondary to POIS, some get facilitated anxiety, and so on. It is a vicious circle, because POIS in itself triggers those psychological symptoms, but the whole life situation created by POIS just make these psychic symptoms chronic, and present even out of POIS acute phase.
I believe that what you describe may be anxiety crisis, because you know where this will all lead - to POIS. Just anticipating POIS is enough to get anxious, because it's a living nightmare. It is just my hypothesis, here, but just the fear of having an upcoming POIS attack is enough to get anxious, and even make a anxiety attack. In the past, when I had no real control over my anxiety, there have been times I would make a full blown anixety crisis just by thinking about the idea of death.... so I know how powerful our thoughts may be over our body. So, for me, it is totally possible to have a anxiety attack, complete with physical symptoms, only by thinking about having a POIS attack.
I think the key is to discern between symptoms of anxiety alone vs anxiety symptoms during a complete POIS attack. Look for symptoms you don't have when thinking about dating, and that are always present in actual POIS, after an ejaculation.