Does anyone have persistent sinus problems ?

I have a stuffy or runny nose everyday. Every morning I wake up with phlegm in my throat. This is year round for at least 5 years. I went to the dr. once and they said I might have allergies and gave me some seasonal nose spray, which did nothing. Is this just how my body works? I don't really think it is an allergy to anything. It's been going on too long and I've moved, used different soaps, perfumes etc.