Sorry to hear you have cancer, two my grandparents died from it.
The Wall and A Clockwork Orange, I know alot of people have never seen them. Saving Private Ryan, Gladiator, Top Gun, The Rock, Face Off, Con-Air, old Bond movies, I know you've probably seen them already, but I would watch them again if i was going through that. No Country for Old Men if you havent seen it. Jackass and CKY movies if you like to see people doing stupid shit get hurt and not care. Porn...
Good luck, and hope you get better