Upon reflection, there’s really only one choice for “scalp & fluffy volume” shampoo:

I think it’s called “restraint”

I’ve had some similar symptoms (without muscle wasting), albeit over a longer period of time. I too lack a definitive diagnosis.

I did get a narcolepsy-adjacent diagnosis, though, to my surprise. I never fell asleep at inappropriate times—I was just very tired.

Hope 2024 is kinder to you.

Could narcolepsy be an issue? Your opening subway story reminds me of cataplexy. Narcolepsy now looks to be autoimmune in nature, and autoimmunes can run in packs.

(Sleep disorders can affect your O2 saturation during the day, too.)