Yours and your girlfriend's pain is palpable.
First the sobering news: If one relies on FDA-approved cancer treatments, the treatments are often drastic with serious and durable deleterious effects. For instance, if you want to raise a family, the treatments might preclude it.
That's why I didn't rely on the usual treatments. I used habeneros peppers, freshly grated garlic, and emulsified fish oil. If I'd been losing weight, I would have used evening primrose oil in place of the fish oil.
My Stage 4 cancer went away in two weeks. That was nine years ago. There were no side effects other than eyes watering for a few minutes, and hyperventilating for a couple minutes. The heavy breathing was a good thing because it gets the lymph pumping.