I Recently - Within The Last Couple Of Months Can

I recently - within the last couple of months can smell everything and anything. It is too the point of gagging and vomiting. I can't control the gag reflex and it is very embarrassing at work and in social settings. What is happening? What can I do to stop it?
I have chronic sinus problems, have dental health problems but go to the dentist every 3 months and have been diagnosed with a type of adjustment disorder (to stress).