When standing on a queue or taking a walk in the mall most of the time i get dizzy. i went to my doctor and said my blood pressure is fine.

If your doctor took: your blood pressure while seated only then he/she may have missed the orthostatic hypotension present and causing your symptoms. Ask for a reevaluation and see what happens to your blood pressure after standing for three minutes compared to a blood pressure taken while lying down. It may be a matter of just increasing your hydration and salt intake to correct the problem.

Most often there: will be some dysregulation of the blood pressure, possibly due to issues with the autonomic nervous system, and repeat measurements of blood pressure needed in various situations--sitting, standing, after exercise, both arms--to try to document this. Making sure you stay well-hydrated to maintain volume in the vascular system is important. Evaluating your inner ear is also a good idea. Stay well:)