I think it is very addictive and thats part of the problem, sometimes i don't know what causes it either. Don't know if your already doing this but my counsellor recommended keeping a little diary just a short intro to say what happened/how it made you feel(or just how your feeling in general if nothing specific has happened)/what you did about it(if you harmed or not)/how you felt afterwards. She said it helps to find out what triggers you have and try and spot them earlier or avoid them altogether.
Although I adapted it slightly and write a little entry every day even if i haven't si'ed because then on the days when i feel ok it's a positive side too and you know you can feel ok when you look back at it.
Hope your doing ok x
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