What does it mean if my whole body goes numb when i'm angry?

Mean you are angry!: Anger will raise the adrenaline level in blood and makes some people doing fast breaths. That is turns cause some chemical reaction in the blood causing the transient numbness sensation

Hmmm,...: You may be releasing adrenaline when angry, which is a very potent vasoconstrictor, that can constrict your blood vessels and somehow have a reaction on your nervous system when this occurs, causing your feeling of Numbness. Best way to cure this is start seeing a therapist for anger management and finding ways to stress less and stay happy, not angry, and better control your temper. Best wishes.