do you like to read...?
i have a reaally short fuse too... but my fuse is wet so its hard to light it most of the time, but when it sparks its only seconds before im acting like a mad man and regret everything i do and say for weeks if not years after...
i like to read though ... it helps a little... i just discovered these things called visual novels .. they are like a video game that you read through and select actions and stuff to continue the story, if you like reading and need a distraction maybe looking into one of those would be good distraction and way to calm down or relax...?
you have to find a way to calm down.. i know how hard it is to relax when you feel like this though so dont take me the wrong way

its just when we are stuck in that spiral of doom it will keep getting worse until we can pump the breaks a little... doing any thing no matter how small to distract yourself / relax can help...