Stress is a very dangerous thing. It can lead to depression, uninhibited emotions and loss of control. It makes people have less and less control over their own actions and causes irrational thinking and horrible repercussions.
Stress can come from a variety of areas like overwork, perpetual insults and irritation, loss of sleep, peer pressure and others. The best way to deal with stress is to relax and take things one step at a time, eliminating the root of the problem, and if new problems pop up, resolve them immediately. Also try to take some time off. Distract yourself with other things if the stress is too bad and always continue to control your breathing.