Thanks for replying, Sky. I can't remember who the girls were (I think it was in P6, which would make it 6 years ago), so I don't know what they were like either. Even if I did remember who they were, it might not make much difference...people change.
That's good to know it's a common thing. It's no fun, though.
I don't think it's likely there are any trauma situations I've directly experienced...I'd remember something, surely?
Thanks again!