Drew, congrats on the new job!
My lovely wife Emiko went through the breast cancer thing just over a year ago, I know exactly what you mean about a roller coaster ride, and it will get worse, but that is short term, long term, it will get better, it has for us, and it will for you two as well.
If you need someone to ask questions to or chat with, PM me and we can set it up, really, even if you just want to vent, pop me a note.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward