If your stress is caused by DUNYA, your dhikir is "La ilaha illal-Allah" for it brings to mind there is nothing worth fearing than Allah If your stress is caused by PEOPLE, your dhikir is "La hawla wala quwata illa billa" for it brings to mind people have no power If your stress is caused by YOURSELF, your dhikir is "Astagfirullah" for it wipes away sins which is caused by anxiety