How do i get rid of my cough instantly?

Silly question: You first have to figure out what the cause is. That could be that is being generated in the lungs from an infection or asthma or a habit cough or an allergy to something in your environment. Or it could be that you have a cough due to a post-nasal drip. Once you sit down with your physician and explore the many possible causes (and these were not all) a solution can be devised just for you.