So you have no assets between you except for his retirement? How long were you married, how old is he, and what is the retirement worth? Is it a pension or a 401k?

Also have you applied for SSI or SSDI? What kind of cancer do you have? I know my friend with stage four ovarian cancer applied for SSDI through an accelerated program for people with severe illnesses like hers - it still takes six months before it will pay though