It's a pity you caught sight of the notes but in a way it's telling you that you are keeping things as normal for your dad as you can so try not to dwell on what you read as you and the family being negative.
You are dealing with the situation in your own way and doing it brilliantly. Perhaps the GP just isn't used to his patient's family being as strong as you are all being.
He hasn't had you in his surgery breaking your heart in front of him has he, you are saving that for your private moments.
You do what you have to do, when you have to do it, to get yourself through this without adding to your dad's distress. It's tough on you all but you are managing it.
You are not doing it all wrong !!
Hang on to that blanket and know that we are all wrapping it round you in our thoughts