are you exhaling through your nose?
me never had a issue.
could be the start of hayfever. in last few years more people have got it that had never been affected in the past.
I usually sneeze in the morning when I come down into the kitchen ... don't think I'm allergic to the wife but dishwasher chemicals perhaps?
I've told her that I'm allergic to Fairy iquid and that keeps me off washing up duties nicely.