Strange Tingle and Muscle Tightening

Hey, so I’ve had several sessions now with both progasm and helix trident and some strange thing has happened a few times. Basically while I’m fairly deep into the session, I’ll start feeling crazy tingling in my hands (feels close to either holding something that is vibrating rapidly or pins/needles when your leg falls asleep). That feeling will then move to the rest of my body. Simultaneously, I won’t be able to move any muscles without incredible effort, as if they’re cramping or I’m going through sleep paralysis.

Is this good/bad/progress? It doesn’t feel pleasurable at all, just really odd.