I found out about your book through Sarah London's blog. I'm a newbie at crochet, but what you describe here is still familiar to me. My experiences aren't as awful as some mentioned here, but I have lived with depression for a number of years. Last year I was struggling particularly badly with chronic fatigue, and there were many days that I couldn't do much more than sit on the lounge in front of the TV. I've loved cross stitch since I was a young girl, but last year was by far my most prolific period. Doing cross stitch meant I felt that I was productive. Even if I couldn't do the housework or write an article, at least I was producing something. This year I taught myself to crochet, so now I can produce items that have a function beyond beauty - slippers, blankets, dishcloths, and who knows what else! I'm looking forward to reading your book - I think I will be able to relate in some small way to your stories.
Hearing about your book also reminded me of this comic written by a friend of mine, from an excellent anthology of comics about depression called Kinds of Blue: http://hivemindedness.com/kindsofblue/knitting_therapy/