Thanks for the quick reply :) I've been in CAHMS on and off a bit before this happened. One of them knew I self harmed, but didn't talk about it. I've found them all pretty useless to be honest.
My Mum hasn't asked how or why or anything like that. It was just mention and that was it really. If she did, then I would most likely get her on the internet about it, as I can't explain it all.
I just don't want to talk about it with her at all. It's such a horrible feeling.