after surgery shortness of breath/wheezing

I was diagnosed with Sinusitis after getting terrible headaches and completely losing taste and smell. I got my taste/smell back after surgery and I've maintained using a Neti Pot with Pulmicort nebules twice a day (get terribly stuffed up if I miss even one). What hasn't gone away is shortness of breath/wheezing, which I've always attributed to post nasal drip. I used to get this once/twice week but now experiencing it a few times a day (even waking up during the night with extreme chest tightness/wheezing). Only thing that helps is using an asthma puffer but I was tested and don't have asthma. Been tested for allergies and take Reactine/Aerious and it still persists. My ENT insists there is nothing that can be done outside of what I am doing and the Pulmonologist didn't have anything else to suggest other than continuing with the puffer. Bbeen trying natural supplements and restricting diets over the last year (including no wheat and dairy for months) but still experiencing.