Writing, for all that it's harder than nursing ever was, is also more joyous and more fun and a lot less dangerous. And the major themes of my life have become the major themes of my writing, too - so it has all worked out pretty well.
Writing is a puzzle you'll spend your lifetime unlocking. You will never know it all; you will never know enough. You can always be better, and figuring out how to be better is part of the thrill and joy of the job.