Sounds silly but maybe go and read some of the birth stories here- I seriously start getting contractions when I read them- maybe they stimulate something? I had to stop reading them last week. I have decided that after the grand final I will read every birth story that exists...LOL
I think there's actually something in that, I have heard snuggling newborns can do it too.

organic-girl, your body sounds more than ready to me, I bet you're holding your baby in a few days. Good advice from the others as hard as it is, try & relax & let go