@Me2 Not twaddle, not twaddle at all. I watched my sister go through this. All clear, then a year later, not. She went through all the emotions you describe. As time went on she focused on making memories for her very young children, preparing them for what was to come, and tending to her personal legacy.
I imagine it takes almost impossible amounts of mental discipline to stay firmly in the present when your mortality is so brutally in your face. Especially when you feel so unwell on a day to day basis. Are your team confident they can get you to a point where you feel a bit physically better?
I want to say things like distraction, try to find at least one thing each day to do that you enjoy, meditate, mindfulness etc but it all sounds utterly trite and in the profound human state you are in, absurd.
In her last months my sister ate a lot of trifle and Indian spiced cauliflower soup, both of which she loved. She drew great comfort from regular therapy sessions, and long talks with an Anglican minister. She also found 'special' brownies worked absolute wonders for her mood and sleep. The latter was at my 81yo mother's suggestion.
Never mind the being amazing, be you to the end, be you every day for the rest of your life. I wish I could make it better for you. Kate xox