Where do you live? It is time for a second and third opinion. There are good doctors out there and many ways to extend life. IMHO it is way too early to throw in the towel.
Again, I really suggest you let us know what part of the country you are in, since we have folks from everywhere on this board and you may hear of another doctor that you haven't yet in your area.
God bless you--you'll be in our prayers.