Thank you all so much for your input. Just knowing that I'm not 'weird' or 'losing it' is very helpful - although the feelings and urges aren't new to me, this is the first time that I've had to acknowledge there's a theme or pattern or reason.
I'd never really seen it as SH urges. For me, SH has always been more immediate or physical, I have cut since I was a young teen and rarely beat it for very long. It's definitely easier to deal with it if I put it in the context of SH. Hopefully I'll find a T who can help me understand more, but I'm still waiting on referral and assessment, and in the UK that might take some time. Thankfully my social worker is lovely, but she's not the most tactful sometimes - I was talking to her yesterday and trying to explain how terrified I am every time I realise I've forgotten something only to have it shoved in my face (either mentally, or a physical reminder like a journal entry). She said something like "If you've forgotten these things then your brain has decided it doesn't need them to be important." which made me cry even harder!
The good side - I managed to get through that episode of urges without too much damage. Just a bottle of wine in the privacy of my own home and a few relatively minor cuts.