I'm pretty sure it isn't.

Edit:

To elaborate, I've had other experiences medical professionals assessed as shock. They were paralyzing, and usually involved uncontrolled involuntary shaking and tears.

This is something quite different. If I entered into such states of shock in the survival situations I'm referring to, I would have bled to death.

My assumption is it's a massive release of adrenaline and endorphins.

Where do you see reduced pain on that page? I would have guessed adrenaline to be suppressing the pain, but that link talks about adrenal insufficiency. “Pain” is only mentioned in the context of experiencing new pains in the abdomen.

Hmm, I think I needed to read that a bit closer. Maybe neuralgic shock is the term then. I hadn't realized they had broken shock up into so many categories now. Thanks for the second-check.