sinuses

I am 64 years female, I leave in South Africa, in Mpumalanga province, tends to be quiet cold here. I suffered from serious cold and flu for a year and this developed to sinus and serious nose and chest blockage. It was diagnosed as sinusitis as well as highly allergic to general air pollution. During this period I have lost my sense of smell. A year later I had a surgery to remove polyps from the nose. One month only after the surgery I had free breathing and my sense of smell came back just for three weeks and it was gone again. Although my noses are no longer blocked, my chest is still congested my sense of smell and taste are gone, occasionally I could smell something for a short period and it is gone again. I went back to my ENT surgeon within three months of the surgery; they suggested that I should have another surgery. WHAT? I could not accept another surgery. This has been going on for the past 6 years now. I seriously need, I will appreciate your help, please help.