Suggest Treatment For Dry Nose And Cough Followed By Nausea

I have had a mysterious cough and it feels like it stems from my ears. The back of my nose is very dry and sometimes I cough so hard that I feel like I m going to pass out. It used to be so bad that I would vomit. Flonase and other steroid medication along with Symbicort have been prescribed with no luck. The cough started from a bad reaction to sulfra.