Being totally honest here, but I think I need practical advice not a kicking.
I keep losing it. I lose my temper and I want to scream and I take it out on myself, punching myself in the face and yanking my hair out.
Obviously, it doesn't "help" but it's quite calming in an odd way.
But anyway, it obviously must be frightening for children to witness. 
I should probably step away shouldn't I?