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I hope that you don't arrive at the point to need all this advice for many years. We all hope that we'll be able to look back and talk about how wrong that doctor was.
I sat with a friend several days in those last few weeks, with all of the chaos of friends and family coming and going. His request to me was to tell them to stop going to the corner and crying as if he couldn't hear. He was going in and out of a coma, but he knew everything that was happening around him. He wanted them reminded that he would have a funeral, and couldn't they just wait until then? We all know what is coming some day, and none of us know how we will react until then. Someone in an earlier post made a very wise comment - live in this world now, and use the time the two of you have for you. Don't grieve until it is time.
And remember, the doctors keep telling us how long we have, and we keep being here to remind them that the date has passed.