Everyone experiences this every once in a while. Although there are many types of stress and many ways to define it, I think that Greenberg and Baron summed it up best in Behavior in Organizations. The definition they used states that stress is a complex pattern of emotional states, physiological reactions, and related thoughts occurring in response to external demands.
Different people have different interpretations of what stress is and how to deal with it.
In fact there really is no set of rules to follow when one gets stressed out. One major factor that causes stress is occupation. A variety of job levels will include a variety of stress levels. These are just a few of the stressors that can occur on the job. There are many factors or Stress Builders involved in the accumulation of occupational stress.