Stimming (self stimulation) helps me to manage anxiety, fear, anger, boredom and other negative emotions. I also stim to help myself handle overwhelming sensory input (to much noise, light, heat, etc). Believe it or not you do it too. If you have ever tapped your pencil on your desk or touched your lip while you where thinking, bitten your nails or rubbed your arms when you are afraid, or paced the floor while you are having an intense conversation you have stimmed.