What am i not doing right ?

Hi every one !

Firt of all, thanks you for all your advices et shared experiences.

I bought my first aneros syn V a few weeks ago. I had a few sessions, but never acheived the prostate orgasm.

I try to relax myself, take my time, until i feel a wave of pleasure. But each time i feel this, i get exited, my heart start beating strong, and it takes the feeling away. I also have sometimes spasm in my leg and in my pelvic muscle, but the same as the pleasure, my heart start to beat stronger, taking the feeling away…

Do you have some advice for me ?

Thank you all, et sorry for my bad english…