Oh Rach it is absolutely horrible when our little ones wean themselves before we are ready. I was devestated when DD weaned to. To be honest I grieved for the loss of our B/F relationship. DH had to give her for over a week because I couldn't bring myself to do it. Grieve your loss because it is a loss.
I have heard that you keep offering them the breast for a feed when they are sleepy because they are less likely to fight you and you keep doing this until she comes around. Not sure if that is completely right (I was told when I wasn't in a good state so can't remember it properly).
Hopefully someone will be able to give you some advice to keep your b/f relationship going.