How do I do this again

To start with your mother may be clear and I hope for one that is what happens, it may well be curable at least they cold be able to buy you a good amount of remission. until you get the results getting anxious and stressed wont help either you or her. Stress is bad for everybody's heath. As for coping I think because you evidently love her and so will want to support her whatever the outcome. I have found it amazing how much strength and resilience we have within us, at times human beings can be really amazing.