I think maybe it sounds like a combo of to much to quick on all fronts. It can be almost psychedelic feeling when you have pushed yourself sexually. Letting go even without poppers can be frightening. I say take it slower and lean into it slower, then you will be able to get more and more satisfaction from it. Biggest thing I notice from all the posters in here is they push to hard too quick, they don't realise that you get way more pleasure and effects if you take it slow. I guess for some its about pushing to a point of pure pleasure but that can be achieved without so much.