@williamjohnston,
Some unsolicited advice, if I may. Do not give up, do not quit, do not assume the medical profession knows all there is to know about how the body fights diseases. I was written off by some very good doctors, more than once. That was several decades ago.
No, I'm not some lunatic who is giving you a list of essential oils. I do believe the act of surrender in the mind can bring about a similar response from the body. I wish you the best, and I truly hope you prevail.