I'm not completely qualified to answer all your questions because I just use a simple 70 dollar home generator to ozonise water. I don't use an Oxygen tank and it works fine for me. But be careful if you're putting 03 straight into the room, too much from an industrial unit can choke someone. It needs to be bubbled through olive oil first.
The best way is to drink 03 water and massage with ozonated olive oil. That's a simple protocol that should buy you some time. Make sure to do it near an open window, but be careful of humidity, use a fan to blow the excess ozone out the window so you don't inhale too much. I swear by ozone but it irritates the lungs. The body needs it in water.
I don't know much about spinal cancer so don't know if injecting spinal cancers is feasible or not. I would contact one of the doctors and ask him. Maybe he can give a protocol for a qualified, open-minded nurse near you.