I agree with the medical side of it. I often don't enjoy when the books go all technical like that. I feel like it's the author's way of saying, see? I did a ton of research and i'm going to prove it to you now.
I enjoyed the flashbacks, that's when I really started to feel for Kate the most. In the present, her character just kind of sits there dull for me, but in the flashbacks I really got a sense of what the poor girl is going through.
As far as Campbell and Julia, I kind of liked the little subplot, but agree it wasn't necessary. I enjoyed Julia as a character and would love to see her get a book of her own. I know Jodi likes to share characters from one story to the next so i'm hoping she'll pop in another novel one day.
Campbell's secret illness is the thing that bothered me most throughout the book. I still think it was unnecessary to give him anything at all especially once we finaly figured out what was wrong with him, I was kind of disappointed. LOL I was expecting more.