I work in a small airless office and since I have worked in this room with a particular colleague I have a blocked nose and what I think is a sort of post nasal drip . Colleague was off work for many months and I never noticed until she returned two weeks ago that the whole time she was off I never suffered with the blocked nose thing . This may sound really stupid but could I be allergic to something my colleague wears or a perfume she uses ? I can only describe the way I feel with this thing as struggling to breathe like I have a cold .