I Have Had A Severe Cough Four Two Weeks Now.

I have had a severe cough four two weeks now. My doctor started me on a Ventolin inhaler, Guaifenesin cough syrup, and a 5 day antibiotic. None of it helped. She now has be staying on the cough syrup but added Zyrtec-D, and prednisone. I am still coughing 24-7. I need to go back for the third to the doctor but can she do now? I am misable and missing days of work. My back hurts from coughing. I am also now having nosebleeds 2 to 3 times a day. My lungs are clear, I do not have ashma, and I am a none smoker.