When standing in front of the ticket counter I suddenly become dizzy and lose my balance.?

Try changing positio. It is possible if you are standing for prolonged periods of time you may have your knees locked. Try slightly bending your knees and if possible take 5 minute breaks to walk, sit. Other causes may be low blood sugar if you skip meals or eat high carb snacks instead of balanced meals. If you are taking medication for blood pressure you may experience a drop in BP which can cause dizziness.