Newby questions, 3 years journey

Hey there! I think I hit the wall in my Aneros journey and need some help. I tried to find some info on wiki but without much success. I will try to explain my problems, thanks!

* I think my main problem is loss of sensitivity when I stimulate prostate, despite of being very aroused. I remember long time ago each session accompanied by tingling in the tip of the penis (pudendal nerve) now I don't experience this at all, despite having all the pleasurable sensations in prostate. The sensations that come from pudendal nerve could grow to orgasmic sensations in belly and eventually transform into full body pleasure waves, and right now all the sensations are limited to my prostate.
* Erection stops involuntary contractions, almost every time I get involuntaries and it feels pleasurable my body responds with an errection and it stops most of the pleasure, I'm accepting the fact and move and also doing breathing exercises to relax and reverse kegels to bring blood back to pelvic flow.

Despite all of that I enjoy my sessions a lot but it feels like these are blocking me from achieving a full potential of the full body orgasms.