A whole lot of shaking, but nothing else

A couple of questions.

I've been using my Helix Classic for about six weeks now. Recently I maybe had a breakthrough? I'm really not entirely sure.

I start with breathing exercises, then add contractions in conjunction with breathing. After a few minutes, I get into this weird headspace that seems closer to intense meditation than anything else. After that, my eylids flutter and I start having very strong muscle contractions in my abs, thighs and butt, but only a few rectal contractions. This feeling is nice, but there's really nothing at all about it that seems pleasurable and definitely not sexual. I've also not had an erection this way at all, and no prostate fluid or any sense of hitting or stimulating the prostate.

The first time I did this, it was even without the aneros in, and having it in doesn't seem to make any difference at all.

I'm really confused. What's happening is definitely intense, but not at all sexual, and seems to be possible with or without the aneros inserted.

What the fuck is happening?