I did ask abut drugs, and they really didn't want to do that. They're already pumping me with steroids, and there are too many unknowns between steroids + relaxation drugs + high-oxygen environment. And I totally respect them for saying that! I also didn't mention to them that the last time I took an anti-nausea drug I wound up vomiting, so my body seems to react oddly to those kinds of things.
Xanax or the like does however remain an option if the doctor decides that the optional MRI I couldn't do becomes more necessary. Shit, if someone had told me the last step before insertion into the MRI tube would be a Hannibal Lecter-style mask over the face, at least I would have been a little more prepared! "Ready?" "Um, to go in to the chamber? Ok, sure, let's try ... " "KA-CHUNK KA-CHUNK CLAMP" "WHAT THE FUCK?!"
Oh well. The hyperbaric treatment looks helpful, but not a sure thing: one of those approaches that gives 20% better results 30% of the time, or something like that. I wish I were able to do it, but I guess it's not going to happen.
Thanks for the suggestions!