A couple other ways to increase oxygen
is to talk to the MD convince him you need the hyperbaric chamber so he calls hospital if you meet the mile long criteria you may go to the hyperbaric chamber or you can buy one.
The other is ozone sauna a medical ozone steam sauna therapy which is nice you can buy one and use it at home
Ozone IV or peroxide IV the prices are high, unless you can cut a deal with the good doctor.