Joe Namath: Experimental Oxygen Treatment Has Helped Brain Heal

Sounds like placebo to me. Its not easy sorting out the competing claims. What precisely does your doctor have to say about this? And not one affiliated with HBOT.
Other writeups here;

A failed HBOT trial here

Peter Levine talking about problems of HBOT here:

Stroke and Hyperbaric Oxygen Therapy

Or maybe mimic high altitude which has been proven to be useful for  angiogenesis. Training the Brain to Survive Stroke

Hyperbaric Oxygen Therapy Can Improve Post Concussion Syndrome Years after Mild Traumatic Brain Injury - Randomized Prospective Trial

TAU Research Team Discovers New Treatment for Stroke 

Can Hyperbaric Oxygen Repair the Damaged Brain?

hbot as stroke therapy - quackery?

Long Course Hyperbaric Oxygen Stimulates Neurogenesis and Attenuates Inflammation after Ischemic Stroke

Hyperbaric Oxygen Induces Late Neuroplasticity in Post Stroke Patients - Randomized, Prospective Trial

This is a fascinating idea, treat your recently oxygen starved brain with more reduced oxygen supply.

 And the latest news here;

Joe Namath: Experimental Oxygen Treatment Has Helped Brain Heal