Anxiety disorders usually a natural response to stress. Anxiety disorders are different, though. They are a group of mental illnesses, and the distress they cause can keep you from carrying on with your life normally. Anxiety disorders are the most common form of emotional distress and can affect anyone at any age. Common symptoms of anxiety are excessive worry, fear, feeling of impending doom, insomnia, nausea, palpitations, or trembling, etc. Anxiety is usually self diagnosable. Anxiety Treatment can be done by a General Physician or Psychiatrist.