No matter how much you starve yourself your blood glucose maintains a minimum level so there is always Sugar in the blood stream. Lowering blood Sugar is going to help but not cure.
Hyperbaric 3x per week is expensive way to go.
Get an oxygen concentrator, run it up to 8 liters or maximum for the machine and do 20 minutes of exercise.
Sleep with oxygen on.
Hyperbaric's high oxygen levels doesn't last for more than 24 hours if that. Cancer is growing 24-7. Higher plasma or blood oxygen therefore must be a daily occurrence.
Many elements of your message are true. Putting them in perspective is helpful I hope.