"What would have happened if instead of working on today's crisis, you wrote something worthwhile for tomorrow?"
Answer: You'd have made progress on finishing your book.
I know. I hear you. "But crises happen!" Of course they do, but I suggest you redefine what exactly constitutes a crisis. If you want to be a writer, you have to write. Labeling the broken washing machine or the car you need to run in for an oil change or the trip to the accountant to get your taxes done as being crises means that you won't set aside time for writing.
Here is today's assignment, class: write down your definition of what a true crisis is. You get a pass on writing for true disasters, but other than that, set aside what may very well be important for the urgency of your writing dream.