Something that helps me is to "ride the wave" and let myself feel the feelings, cry even, and get the emotion out. Then I feel a lot better and the urge to si is greatly reduced. Another thing that might help is to do something with your hands like knitting or playing with a rubber band to get some of your energy out. I like to twist a hair bad around my fingers until it hurts a little, and keep doing it. This helps me to feel some pain and do something with my hands that isn't inherently harmful.

I also think it is important to feel what you need to feel without sensoring yourself. Try letting yourself get the emotion out and see it you still have the urge to SI. With me I tend to want to SI when I don't want to deal with and feel the tough feelings. When I let myself feel them, I feel better and less likely to SI.

Please feel free to PM me if you want to talk or anything.