I'm a Medical Librarian (retired), but I still am in the game of "practicing" my profession as it were. Librarians don't if they're ethical and professional offer medical advice- we leave that to the medical professionals (we aid medical professionals by training them in searching techniques) and we help patients by making referrals of all kinds - to institutions, doctors, books, media, recreational pursuits, etc.
Having said all that, obviously your news isn't good and for that I'm sorry. I think it would be difficult (I could be wrong) for the medical professionals on the site here to give you a "cut and dry" answer without having seen you, your scans, your medical history, etc. I also think it might even border on being unprofessional since we/they don't know you personally and how you might take such news on hearing it on a public computer site without someone being with you.
I think that the best thing for you to do is for you to seek an answer to your question through your oncologist. Once you have that answer, I think your next step is to get a second and even a third opinion. And then, I think (actually I think you should be making this call first) - call up CancerCare and schedule an appointment with an Oncological Social Worker there for yourself. Their training is specifically geared to help all of us with cancer (I'm going there now [I have BC] for counseling - I think they're great!).
I have no specific knowledge of the answer to the question you're seeking and everyone's situation is different. (My BC is complicated by the fact that I'm a Lupus patient).
My best suggestion is to take each day as it comes, live mindfully (Zen concept). I do have a book to suggest to you and that is Crazy Sexy Cancer Tips by Kris Carr and Sherryl Crow and there's a sequel Kris Carr wrote called Crazy Sexy Cancer Survivor. They're books about her (Kris Carr, who's a young woman with a rare, Stage IV Cancer and how she has to come to terms with living with it). She also finds herself good people to surround herself with and that's perhaps the best advice I can offer you myself at this time besides getting some good books on meditation and breathing. If you belong to a religious community, this is a good time to connect with your clergyperson for a chat and maaybe some fellow congregants that you're close with for company at home or to accompany you to M.D. appointments.
If I can help you in any way, please let me know. I hope that you are comfortable and I'll keep you in my thoughts.