How do I handle my anger issues?

I talk to my co,workers who are nurses and some dr,s but I have anger ..esp since my sister died , I just learn to control it I'm a nurse and I keep in a lot of feelings ...I have to remain calm ..I run a unit in a hospital...so I just give a quick talk to work friends or I go home and talk to the cat. My cat listens very good .. and I cry ..you need to talk to someone ,,to,learn to control it ,,,

Therapy?