Warning: Lengthy, evangelical posting.
I've mentioned this on other threads because I'm excited about it and am hoping that one day it'll help someone.
I have several allergies (dog fur, pollen, dust) and, for as long as I can remember, I've been blowing my nose all day every day.
I was diagnosed with asthma at age 14 and took drugs (brown and blue inhalers) every day of my life, was often horribly short of breath until 7 months ago.
I took my son off dairy and wheat under advice from the naturopath to try to sort out his snotty excess (sorry TMI). I also avoided those food groups and my asthma and sneezing have disappeared. I haven't used asthma drugs for about 7 months and it's bloody brilliant.
I still have the odd very occasional and light reaction to pollen, but it's a breeze compared with the old life.
If only the doctors had thought to look into dietary factors earlier, but they don't. It's mad.
This won't work for everyone, but surely I'm not the only one. It's worth a go. Cut out the suspect foods for 6 weeks and see how it goes.