Sorry to hear of your sons condition, HBOT certainly can’t hurt and the concept makes sense. He has youth on his side and the incredible healing power of the human body.
About 25 years ago I looked into it in desperation and found one nearby and spoke with someone at the facility, it was a reasonable out of pocket per treatment I thought at the time. I had horrible facial nerve pain and had work ups from several medical disciplines. I could only sleep sitting up...