I have a recurring sore throat now with some swelling for over a month. Finally went to doctor last week, no sign of infection but put me on a prednisone dose pack and zyrtec which cleared it up while take the meds....yesterday was last day of dosepack and its back yet again! have mucus in back of throat with this but no other probs like nasal or chest congestion and dont otherwise feel bad at all.....any ideas?? tried everything else from antihistamines, zyrtec etc for allergies but doesnt seem to help much.