A couple of days ago out of the blue my nose was terribly itchy and blocked. I then started to constantly sneeze like a nutter with yellow snot dripping at the back of my throat. The yellow shite has finally settled on my chest and now I feel positively miserably (I have asthma too) - was this sudden onset a hayfever attack or viral? I always thought hayfever snot had more of a clearer presence to it..