Stress is not caused by events of others or the outside world, but caused by your thought.
Pressure is not stress. When certain element are added to pressure, it turns into stress. That element is a tendency to keep on "ruminating" past events repeatedly with negative emotions.
Rumination is a continuous and destructive act, lowering health condition, productivity, happiness. It is detached from the present to care about the future from the past, therefore , it must be impossible to complete the work in front of you.