While being prepared for the worst is good, I wouldn't 'throw in the towel' just yet. People do survive even lung cancer if caught early enough. While I haven't had what you have, I have managed to survive two different episodes of cancer, one of which was an unknown primary with metatsis to one lymph node in my neck.

Have you had a CT scans of the neck and chest and a PET scan of the entire body? I'd say 'chin up and let's go tackle this'.

Take care,
Eileen