How to get rid of a cough in a week!! please help quickly?

i noticed over the past day or two that i feel like i have to keep coughing so eventually its made my chest hurt. theres no mucus or any of that this cough is mostly dry but if i exhale quickly or use all of my breath to laugh i have to start coughing but other than that i'm fine. i have gmc's saturday for swimming and i swim everyday so i need to get better quickly!! do you recommend i take off a day to rest? thanks!!