Orgasmic feelings without prostate focus?

I had a new sensation yesterday that’s continued into my anerosless today.

Last night I was having a first aneros session after traveling and otherwise holding off for a while. Not a strict hands-free session as I was stroking myself, using the aneros and looking at some exciting images. Usually my prostate starts throbbing, feeling heavy, getting bigger and generally getting more noticeable throughout the session, but yesterday it felt unusually quiet. Towards the end of the session, I stopped stroking and focused on my prostate area with no contractions. I couldn’t feel any prostate-centered physical sensation, but suddenly I came so hard I shot over my head. I was totally surprised that the orgasm snuck up on me without any prostate-based physical signs.

Fast-forward today and it feels oddly similar. My prostate doesn’t have the usual heavy tingling / butt buzz that comes the next day after a session. However, when I focus on the prostate area and relax, I feel orgasmic shudders/waves rolling down my body starting from the top and back of my head. Eventually with a mini orgasm my anal and PC muscles start getting tight and contracting on their own, but still there’s no usual heavy-prostate centered feeling. Mentally when I turn my focus and receptiveness to the prostate, it still feels nothing but the waves start tingling down from my head again.

My prostate suddenly went silent but is still doing great work. Has anyone else had an experience like this?

Distracted by Ab convulsions

I had a fun session yesterday. I was really feeling some amazing sensations: tingling, throbbing, warmth, heartbeat centered in my prostate, prostate pressure, a hot fluid feeling just hovering in the tip of my penis like a prolonged ejaculation, rectal / pelvic floor / prostate contractions.

Suddenly every breath out send me convulsing forward like a power-sit up. It was erotic to be out of control, but there was no pleasure inherent in the movement. Rather, it started weakening my focus on my prostate and other pleasure centers. I tried relaxing, I tried echoing it, I tried ignoring it, but I didn’t have any great success.

Has anyone run into this? Any other convulsions with or without pleasure? I’m fairly sure I need to just relax to the point that it doesn’t happen, so I can keep building the main arousal and sensations. It doesn’t seem like muscles spasms are as good of a focus point as the more typical erotic centers.