I am quite prone to sneezing and having a runny nose as I have a dust allergy but I can keep it under control with one-a-day antihistamines. For weeks now, though, I've had a runny nose that I don't think is anything to do with the allergy and although runny, it's also stuffy, so I'm going through this endless cycle of blowing my nose constantly plus taking a decongestant nasal spray just to be able to breathe. I thought at first I was in the early stages of a cold but whatever it is is just lingering around getting no worse and no better. Literally all day every day it's a tiresome round of sniffing, blowing my nose, spraying nasal spray then starting all over again. No sinus pain, no green mucus, no other cold symptoms. Just this, but I don't think it's the allergy. What can I get at the chemist that will knock it on the head?