hope4thebest,

the theory of HBOT, ªwhich some others here could explain better than I, is like this:

You're breathing under pressure.
This permeates Oxygen into your muscles "Under pressure".

I took my children to the FLA keys, and my son and I got certified for open water diving.
Now, I'm off course,
but,
at the end of that first (Physical day) as opposed to classrom stuff,
I thought, having simple rsd and tos, (as opposed to my tbi and discs now),
I'd NEVER be able to get out of bed the following day.
WRONG!
I woke up first, got my kids fed, and we were off on the first boat!
Again!
All day, four dives! (tanks).
Now, the Keys aren't deep. But, i got down to about 40-50 feet, and more. (33 feet is considered an "atmosphere", so at 33', you're @ two atmospheres of pressure, understand?)
So,
the air you breath in, is permeated doubly into your muscles and nerves.
I'm not sure if Oxygen is considered a narcotic, but I have it connected to my CPap machine, and I need a prescription.

So, then again, the third day, I was able to get up at dawn, and put on all the equipment , go out and pass the course.
My son took a bit longer, and my daughter was too young.

Anyway, it was quite an adventure, as I rose from the "bottom", I looked up, and my daughter was snorkeling. (supervised of course), and I was the only one who could see a Barracuda, as big as her! swimming parallel with her, an arms length away. (Dam!) that's panic!
The 'cuda looked her over, and swam off.

If you ever get a chance to get certified for diving, do so. (I'm pretty sure the "Y's" all have programs for this!
You can just get a tank of air, visit the closest deepest place or pool you can get into, and just sit on the bottom, and breathe you tank. Even the pool at the "Y".
Swim a little if you can. (This REALLY has an advantage over HBOT, it works your muscles, and the oxygen gets in deeper).

But, It's pretty nearly the same as having HBOT treatment.
After a days diving, I was invigorated, and ready to do Anything!

Diana, I hope will add to this for me, I think she's more qualified than I.

Thanks, and enjoy, (if you can)!

Pete