I hope you'll never give up hope, no matter how. I would like to say that miracles do happen, but I don't want to refer to it as a "miracle" (as if this were something unreachable), even if it was a 0.0001% chance I'd cling to that tiny glimmer of hope with all of my force. This struggle is the true meaning of life, once we give up it's all over (I recall having lost a dear relative to, dare I say, not disease itself, but rather despair crippling him from pursuing his treatment)
So.. please, don't get crushed by this and reconsider any possibilities you still have...
You need to be optimist now more than ever, it's not over yet. I hope this didn't sound too cheesy, but I hope for you my best wishes of having a fulfilling, happy life. Let this not be a farewell...