http://www.rxlist.com/
flonase-
side-effects-drug-center.htm
I think it's the Flonase, in my case adverse reactions are: mild swelling (throat), sore throat, white sores/dry spots in the throat, nausea and vomiting, sinus irritation and congestion, pain in the lymph node area. I also experienced feeling difficulty swallowing, dry cough, dry throat/mouth -- all signs of a relatively severe allergy.
Lots and lots of sufferers online have been asking about this.