Hello, For About The Last 2 Months I've Had A

Hello, for about the last 2 months i've had a persistant dry cough. At first it was one of twice a day now it's quite often on a daily basis. It will just hit me at any given time, sometimes water will help and other times it won't. The coughing usually last about 10 minutes or so. I don't feel sick but the fact that i'm coughing everyday all through the day is really starting to bother me.