I wouldn't suggest supressing it totally unless there was no other choice. Doing so is akin to blowing air into a balloon. The Postal Service no longer coners the market on workers who snap and go on killing sprees at work. Recent news events bear this out. It can happen to anyone in any industry and, quite often, innocents may find themselves victims to a rampage by a disgruntled employee.
Some employers offer counseling to employees dealing with job-related stress.
Workers that are without this option may find it necessary to seek professional help on the outside. I'm not sure whether these priviate counseling sessions are covered by most insurance providers, but it may well be worth the cost. Remember, your boss isn't going to be the person to get reprimanded if you lose your temper on the job. Therefore, it's up to you to control your own anger and emotions at work. The new top dog was brought in from another branch office in the state while I was away attending the birth of my daughter.