Hey Oz, don't know where you live, but have you considered cannabis? I am no doctor, but my Aunt was diagnosed with stage 4 lung cancer that had spread to her spine and lymph nodes and elsewhere. Doctor gave her 6-12 months, max, even with chemo.
She moved out west (Arizona) and found an integrative medicine doctor who prescribed her cannabis as well as some other herbals. She lived for five more, good, strong years. I know at one point talking to her her tumors had actually shrunk and a couple were gone. She might have lived even longer but she had a raft of autoimmune issues even before the cancer that were wreaking havoc with her liver and what not. She was also a lifelong smoker and didn't quit even after the diagnosis, though she did try and managed to cut back some.
I don't know what form of cannabis she was using (and she's gone now so I cant ask her) but from what i read she is not alone in seeing near miraculous results from it's use as a cancer treatment, and there is increasing clinical evidence and research that is supportive.
Even if you can't or are opposed for some reason, don't give up... I'd urge you to find a good integrative medicine doctor. Not "alternative", but integrative--- integrative docs are regular docs who embrace traditional western medicine but supplement it with eastern or other protocols and methods. My life was actually saved by such a doctor when every other doctor was flummoxed by my situation-- but that is another story for another time. Moral of the story is "Don't ever give up", never stop looking for a cure or treatment, and don't be afraid to push your doctors if need be.
Thoughts and prayers for you!
H53/W51, R-ing 4/'18
"Do not arouse or awaken love until it so desires"-Sg.of Sg 2:7
"So oftentimes it happens,that we live our lives in chains, & we never even know we have the key"-Eagles III 1:3