Y'know, I wonder if it could go both ways, depending on how your body reacts.

I had one neurologist tell me I wasn't breathing deeply enough, so when I got the pins and needles to breathe MORE. (too acid)

Oooh, that backfired *badly*.

Neurologist #2 told me it was the other way around, that I was breathing too much and when I got pins and needles to breathe LESS. (too alkaline) He pieced it together from clues about how this didn't happen when running or biking or racing, but when I was resting. (lactic acid when I'm active makes me able to blow off all the CO2 I want, my blood doesn't get too alkaline cuz the lactic acid is my friend.)

That one worked.

Maybe it just depends on what symptoms you get when your blood gasses are out of whack? Some folks go one way, some folks the other?