I have had a dry cough for weeks now, I went to the doctor at the beginning of the week and they told me it could be the start of bronchitis, they gave me three days on prednisone and five days on benzonatate, I am currently on day four of the five on benzonatate and finished the prednisone and am still having this cough, and not feeling much beter. Is there anything else I can take alone with the benzonatate that will help relieve my cough symptoms?