ANTI HYSTAMINE and Fexofendine Hydrycoloride

My question is i have been prescribed Fexofendine Hydrycoloride for an ongoing sympton which I have had for 6 months. i am concerned about taking these for something that has not been confirmed.

Since february of this year I have had on/off symptons of catarrah in my nose/throat, causing

me to sneeze alot, and also cough to the pint of reaching from my stomach, sometimes choking.

I have now developed some headaches, twice a week. I am not out of breath or feel ill in myself.

I was prescribed anti-biotics twice but thye did not clear the symptons. I also suffer with hayfever and taking tables and using a nazal spray did not help. The hayfever season is over now and I am no different.

Any advice please would be appreciated. I have had a chest X ray and it was clear.