It is normal for everyone to worry and feel stressed when particular life situations demand it. Anxiety is a feeling of apprehension, a typical response by the body in anticipation of impending unfavourable conditions. 

Before writing an examination, going for an interview, making a presentation, running late to work, getting stuck in traffic or sky diving would make most people anxious, which is normal. Anxiety is in fact, a healthy emotion that is necessary for survival because it acts as an internal alarm to foreseeable problems.

Types of Anxiety Disorders
1.Phobic anxiety disorder (specific phobias)
2.Agoraphobia
3.Social phobias
4.Generalized anxiety disorder
5.Mixed anxiety disorder

Symptoms of anxiety
Worries about unfortunate events in the future
Difficulty in concentration
Feeling nervous, fidgety or “on edge.”
Restlessness
Increased or decreased breathing rate
Dizziness
Dry mouth
Lightheadedness
Tremors of the hand or shaking of the body
Difficulty falling or staying asleep
Tension headaches
Sweating excessively 
Increased heart rate 
Palpitations (awareness of heartbeat)
Chest pain

Medications for anxiety?

In addition to psychotherapy, your doctor may recommend medications such as:

Antianxiety medications
Antidepressant medications
Benzodiazepines
Beta-blockers
Click here to read in detail
https://blog.cribmd.com/anxiety/