so I've been in "HBO" 23 times now (15 min dive - 25 meters, 30 min oxygen, 15 min rest, 30 min oxygen, 15 min rest, 30 min oxygen - 15 min surface)
Except that I am mentally better, I have not felt any positive effect.
I see a bit worse - it should stabilize again after a few weeks.
My bowel movements have gotten better (not sure if that has anything to do with it).
HBO is said to have an impact for a few more weeks.
If anything happens I'll report back!