3rd session – was I on the right track?

Just had my third aneros session, with a progasm. Yeah I know it’s not the best for a beginner but I liked the size of it. Anyway, my first two sessions nothing happened at all and I didn’t even know if it was hitting my prostate or not, so I was a bit disappointed and maybe thought it wasn’t the right one for me, I was also aware that there’s a common experience of not feeling anything. So this time I did a bit more reading and tried to take it as slow as possible. I was on my side originally as it says in the user guide and just started flexing as slowly as possible. I was just relaxing and taking my time with it, then suddenly I was getting a rush of adrenaline, my dick was getting hard and my breathing was getting faster, and I started getting some horny thoughts. It was exciting but it subsided. It happened again and subsided. Next I laid on my front, and managed to get that feeling again, but my body was starting to convulse almost on its own and I started thrusting as well. I wanted to chase that feeling again, it felt like a buildup to an orgasm but nothing happened in the end. Interestingly enough I didn’t get any fluid or precum from my dick throughout the entire session, or the “pee” feeling, I got up and had a piss halfway through but didn’t know if that had anything to do with the session. Would like to know your thoughts and if this is what it’s supposed to feel like.