Some years ago I was suffering from severe sinus headaches, so much so that I saw an Ear Nose and Throat specialist who diagnosed non-allergic rhinitis and referred me to a neurologist for the headaches. The neurologist referred me back to the ENT specialist, so I was left nowhere to go. I continued to suffer from these headaches as well as several bouts of sinusitis each year. It turns out that for me salicylates and dairy are probably the culprits and I have not needed any antibiotics since last September, when I started failsafe. I thought it might worth telling you this, as I was just reading your factsheet about hayfever and allergic rhinitis. I think it applies equally to non-allergic rhinitis - Joanne by email. (see updated Factsheet on rhinitis etc)