I crossed that bridge and told my T today and now I feel greatly relieved. JoBo - you were right - the worry was much worse than actually telling her. I don't know what sort of reaction I expected, but she was quite ok about it and said that it was fully understandable in the circumstances. She did suggest using other methods to prevent actually cutting, like holding ice in my hand or flicking an elastic on my wrist, just as a means of deflecting the urge away from causing physical injury. I'll give that a go next time I'm in that zone. I'm hoping that revisiting this old method of coping is short lived and passes away soon. Thanks for the support.