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Quick update, I got on fine. It was easier than I thought and the lady I saw was lovely.
It was, er, emotional to say the least. I didn't realise I would be doing most of the talking, and we literally went through a timeline of my life.
There were things I spoke about that I had no idea effected me to this day, but judging by the tissues I went through (very unlike me), they obviously do.
I'm going to see someone on a one-to-one basis, for two hours every week, until the middle of the new year, and once a week as a group session.
As for the 'self harming', she was more concerned about me 'taking care of them' than what I was actually doing. I explained about my fears for my children, and she asked why I thought this and reassured me that this would never happen unless anyone thought I was a danger to anyone else, which I'm not. I'm not even a danger to myself (I'm not suicidal in the least bit).
Thanks again for all the help and advice. It was nice to be reassured that I'm not actually 'crazy', and all the thoughts and feelings that I've been experiencing are in fact very common.
Thanks again.