I can't think of what could be wrong with Misty unless she has some kind of blockage in her throat, but how would she do that? Maybe it's an allergy and I'm misunderstanding what you are describing.
http://www.valleyvet.com/ct_detail.html?PGGUID=2e87c385-7b6a-11d5-a192-00b0d0204ae5I read that on the site HOTD posted but look at this. Sulfa seems to work too.
When I was cleaning SLs nostrils out I could get really high up in her right side but the left swollen and only open about half way and she has mucous coming from her tear ducts. She looks so miserable. I feel bad that I didn't vaccinate them for this but she (both of them) got what the vet ordered. Mine told me it still doesn't give them immunity but just lessens the disease.