As for how it helped me as a witch. Well witchcraft was one of the many things that suffered. I neglected my established practises and routines and my shielding went to pieces. And when finally after the novel was finished and I had the time to examine my spiritual health I understood just how much I needed those practises. I realised I was in significantly better health and happiness when I was grounded, meditating regularly, practising my craft and taking the time to step outside the world. That was my learning, not to ever again let anything become so important to me that it could endanger my health to that extent.
I'm currently about to finish my second novel and I have taken this learning seriously. It took me nearly a year to start again, I think I shocked myself a bit with just how much it took over my life. But this time I am in excellent spiritual health, established in all the elements of my craft that I undertake with regularity and determined that my writing, albeit a big part of my life won't become all there is in my life.
Image http://www.sxc.hu/browse.phtml?f=view&id=1368361 (pear 83)