I think what has happened in my current novel is that I'm am starting to echo my heroine's emotions. She's spent most of the novel been relatively muted or sensible or unperturbed. Part of the novel's plot is that her emotions begin to manifest more and more strongly. In the last week, she's been extremely tearful and/or depressed, furiously abandoned, painfully alone, with no one at all to talk to about anything ... all just like me. Because these events were already planned, I have to presume my heroine is not a reflection of me but the other way around - and if I'm to experience what she is experiencing, then what is it going to be like when the horror of the murder arrives?
I was worried at one point that I wasn't getting inside the head of this novel ... I think that's sorted then ... !