I never tried hyperbaric, but, I did do scuba!
In the FLA Keys, Antigua, Jamaica, like that.
And, while being taught, (certified), I thought, wow, there is NO Way, I'm even getting out of bed tomorrow. (My son was doing it with me, and my daughter was just snorkeling). too young.
But, darn, if I wasn't able to get up Earlier than usual, feel better than usual, and go do it again, and again for say, four days!
No way! I couldn't believe it!
In the Keys, you can't go too deep. Every 33' is considered 'one atmosphere' so at 33 feet, you're at two. it's tough to get to 66' in the keys. But the water is generally clear, and the sun shines to the bottom! (I've not gone nite diving yet).

Oh my goodness, the relief was incredible! And,, the difference between diving and just laying in a chamber is that the O2 permiates your muscles deeper, because you're using them. If you have the cash to layout on a trip to the FL Keys, and the hotel and the training, I suggest it highly!
You'll have an instructor at your side always, and you'll do quite a bit of training on the surface (understanding the principles), then to a pool, then to the ocean, and explore the reefs!

Ever see finding Nemo? It's just like his home!

As for a chamber, I would theorize that you need to be able to move around, and 'excercise' a bit while in there. Go to PADI, (the group that certified me), google them, and get more info on diving. As for the chamber, they're expensive too, and you'd need to check with your insurance...

Hope this helps a bit.
Be well!

Pete

(PS, I have full body).

ASB