I wasn't even that angry and a coworker was afraid of me

I was getting frustrated and stressed out. When I start to get angry I get either very quiet or start complaining in a tense trying to keep calm voice. I guess I started to get this intense crazed look on me. She kept trying to calm me down and it wasn't working. When I'm angry my mind is made up that I'm going to be angry and it's just best to let it run its course. Thankfully I was off soon so when I clocked out I sped off to the liquor store because I deserved it.