I just wanted to chip in here and say that I so agree with what the others have said to you about focusing on the present and not thinking about the what if's and could have's. Not thinking about them can be hard to do I know, but to be honest, thinking like that will get you nowhere. I went through that for a bit with my dad after his diagnosis as well and as Lainy says, it is a waste of energy.
My dads CC was deemed inoperable from his diagnosis and I can still remember what it felt on hearing that, like getting hit in the head with a baseball bat. I know you are scared, I was too and that is normal. Your mum will need you to be there by her side throughout and to be strong for her and i know that you be able to do both. And you are not alone in this here, we are all here with you as well. Please keep coming back here and let us know how everything goes on Friday and what the doctors say and recommend.
Any advice or comments I give are based on personal experiences and knowledge and are my opinions only, they are not to be substituted for professional medical advice. Please seek professional advice from a qualified doctor or medical professional.