Hi, Maggie,
I'm a stay-at-home mum of three, and I also work part-time as a reiki therapist. I used to write off and on, in odd moments, often when I was exhausted - basically I was giving writing the scraps of my time. After having some coaching I realised just how important writing is to me. My youngest is at pre-school four mornings a week, and I book out one for working, one for household stuff and two for writing. It's meant a drop in income but I'm much more fulfilled and because I have faith in my ability to write I also think it will be better for us financially in the long run.
Can you find just an hour a week to book out for your writing? If your writing is that important to you, think about treating is as you would a major client, even someone you love - you've made a committment to it and you will not let it down. You are used to committing to work for your PhD, so you know that you can do it. And if you find that you don't have an hour a week, you can ask yourself why it might be that you can't find that time.
As for getting your book published, well, I can guarantee that no-one will publish it unless you actually write it!

Jay - how awful

. Great to hear that you are so positive about starting your work over.
Angel