It’s been mentioned a couple of times here, but please immediately check with Social Security about getting disability benefits. Check this link - don’t want to give you false hope because I’m no SS expert - but the info in the link appears to say that you may qualify given your conditions:
https://www.nolo.com/legal-encyclopedia/social-security-disability-process-cancer-patients.html
Side note: I’m very sorry to hear your story, and the fact that you are more concerned with your wife’s well-being is so commendable.
Re: treatments - I hear commercials all the time for “stereotactic radiosurgery” that focuses beams on tumors vs. traditional modalities. Perhaps worth a look into that if none of your doctors have ever mentioned it. But regardless, please immediately check into the Social Security disability question.