How Can Chronic Cough And Post Nasal Drip Be Treated?

for the past 2 weeks or more I have awakened with congested cough with increased mucus,,that is clear ,,after i am awake for about an hour the cough is infrequent and non productive,,dry tickle,,I have had several episodes in malls, etc where I feel I can t breath and cough uncontrollably,,til I leave the area I am in,,My sister had esophageal cancer and another sister had brain cancer,,another breast cancer,,it is starting to worry me,,no fever,,no pain,,my voice is always raspy and people ask if I am sick...