Under more normal but busy times, it can give you energy to help you get things done. But sometimes anxiety can be out of control, giving you a sense of dread and fear for no apparent reason. This kind of anxiety can disrupt your life. Anxiety can be a general feeling of worry, an attack of feeling panicky, a fear of a certain situation or a response to a traumatic experience. Symptoms of generalized anxiety disorder include muscle tension, trembling, shortness of breath, fast heartbeat, dry mouth, dizziness, nausea, irritability, loss of sleep and not being able to concentrate.
Panic disorder is another type of anxiety.
It occurs when you have repeated periods of extreme panic, called panic attacks. Suppose one day you're getting out of your car and about to go to work. Suddenly your chest feels tight. Your heart races. You begin to feel dizzy and like you might faint.