I took Flonase for a few years. There was something I read back then about a content in the product that naturally occurs in the body, so that made me feel better about using it. When I ran out I did not ask for a refill & used over the counter sprays, eventually tapering down to saline. As I am more concerned about cross contamination and spraying into the sinus. I have a history of some nasty uri's and decided this method is not the answer for me. I wanted to try something else and did. I think Flonase is a good & effective product. I take medication for something else and it does contain and anti histamine so I don't need another medication. I had allergy shots for a while but I did not continue that for various reasons. You could research the product. Before I take a medication, I read through the info packet. It gives a lot of info and the chemical composition. Since there is no cure (accept avoidance and living in a bubble) this is what we have. There is the homeopathic route

When I am very congested I take my medication and rub a small amount of Menthol/Eucalyptus by the collarbone/chest which helps clear my nasal sinus passage so I can breath through my nose. Before all that I used to use the vicks stick (inhale it through nostril)

Take Care, G