Bonnie:
that really sucks! The mask use is totally inverted. When you dive (recreationally) you use a breathing mask (regulator) for 45min - 1h or so but in that case a) something interesting is happening and b) there are regulators that allow you to adjust the resistance of the demand valve.
re chambers: check this out for a picture (yes the tanks are singles and you are lying down)
http://www.oralcancerfoundation.org/dental/hyperbaric.htm
My suggestion would be to see if you can go to a different facility. (try a wound healing clinic).
osso bucco.... that sounds good, I will try this.

Re statement:
"The tank that I am using is according to their literature the biggest and most advanced in Illinois."

HA! The power of advertising...as long as it sounds convincing it does not have to be true. (> newspeak).
.... bigger... so what????


Best

Markus