try filling a bottle of water and imposing to yourself to drink it all before doing anything (water cools me down and makes me a bit calmer) and take some sheets of paper and a pen and just draw on them what you are feeling. not like a sensical draw. make it abstract. just draw lines without taking the pen off the sheet (yeah make it very messy). pushing the pen very hard on the paper, the sound, the mess that comes up, helps me taking that need of cutting me all out. you might need to fill more than one sheet before being satisfied though.