All sorts of emotions regulate the human brain; feeling anxious before an exam, job interview, or moving to a new location is a normal healthy emotion; however, In the case of anxiety, the feeling of fear may be with the person all the time.
Typically, anxiety is a feeling mainly of tension, characterized by stress, fear, unwanted thoughts, and stimulating physical change such as higher blood pressure.
This anxiety disorder is characterized by a sudden feeling of fear that converts into shivering, sweating, nausea, breathlessness, confusion, and dizziness.
The feeling of helplessness and loss after being separated from a person or place is normal, but it should last a short while if the time is prolonged to a few months to years.