(((Petunia))) Thanks. This is actually something I've been worrying about for years now - I didn't want to speak about it, because I convinced myself that the only way to be sure I wasn't seeking attention was not to say anything. It feels good to be able to talk about it at last!
I've imagined it happening again at high school a couple of times - I know it can't, because there are a lot cameras and the doors are kept locked between classes, but that didn't stop me...I think I have an overactive imagination.
I'm not seeing anyone at the moment, but I spoke to a doctor last week (I made a post about it
here), and she said she'd refer me to a psychologist, although it might be a few months before I can see someone. But it's been 10 years, I should be able to wait a bit longer, hopefully!