is it possible to have a reaction to flonase? I used flonase 6 days ago for allergy issues and within about 20 or 30 minutes I was very nauseas. I vomited once that same day and have been feeling sick to my stomach to some degree all week. I also developed hives on the tricep and bicep areas of my arms, the backs of my thighs, my buttocks, and a few random spots on my torso. I noticed those starting to bother me 4 days ago, on Tuesday evening. I haven t used any new soaps, lotions, detergents, or foods into my diet and I m not taking any other medications except a probiotic most days.