So sorry to read about this, I can understand your situation after going through a diagnosis with a close family member last year there is an inner-strength you will find, both to accept and come to terms with your emotions, I would really recommend talking to someone, especially the Macmillan support nurses on their site. They've been very helpful at talking me through my own recent diagnosis, putting things into some form of logical reasoning, they helped me see things a bit clearer and helped me not to get too far-ahead of myself with irrational thoughts.

Give Macmillan a call, or the CR support line on this site. That's what they're here for. I hope you find some strength and courage to help your mum get through the next steps. 

You can do this x