Well, I'm glad to say I have to eat my words from last week. Hyperbaric oxygen is working!! I now look like I crashed my racing bike and made a one-point landing, and have terrible road rash ... but the color is right and there's capillary refill. Wow. I'm totally impressed.
Bonus: I have no lightheadedness after treatments (I've been having a little trouble with fatigue and lightheaded spells since surgery - haven't adjusted to being acutely anemic). And my thinking, memory, and focus are better for several hours post-treatment ... so I'm going to finish studying for this Biostats quiz in the next couple hours and CRUSH it.