Reddit mentions of Hyperventilation Syndrome: Breathing Pattern Disorder

Here's the book with option to view inside to learn more about HVS but it doesn't show the "good breathing" section.
I think we're aiming for the same thing, it's just when I hear deep breathing I imagine people taking in too much air and making themselves dizzy. For instance a common "anti-anxiety attack" method is to take big breaths which sadly makes things worse for the patient!

I focus more on the out breath and relaxing my neck and shoulders whilst breathing from the stomach area rather than chest. Also nose, not mouth!
It's a very interesting read for anyone considering it, have a look at the preview which exlpains the "system in stress" idea.