I am SO sorry to hear this. I can really identify with your despair, anger, sadness - all of it. I've been there, too. If they are doing a PET scan, it sounds like they have not given up hope. At one time, my husband was given a 12% chance of living (even after surgery) - that was 5 years ago. He was so shocked by the statistic that he went into shock, into the hospital, and then got a lecture from a very kind doctor who explained 'the nature of statistics' and how they are derived.
I hope that you find answers and peace soon.
There is another part to this forum that deals with feelings - I've been very impressed with the compassion of that group. Perhaps reading their messages would bring comfort.
Please keep us posted.
Hugs,
Betty