Hey! I'm not 100% sure on how it works - I think respiratory alkalosis results in tissue acidosis, but yeah, I'd have thought if your blood was on the acid side and you can hold your breath for that long, you're probably fine on the breathing front. I've not had that checked myself. I had checked urine ph, which can give you a clue as to whether you're hyperventilating. But mainly me discovering hyperventilation syndrome was stumbling across the symptoms and finding relief in the treatment. Which is sort of how I approach everything with CFS. I'll try anything, so long as it's safe, and see if it helps.