Is it possible to cure nasal polyps and inflammed sinus that are affecting smell?

Hello doctor,

After a severe cold including heavy sneezing, runny nose that lasted 3 to 4 weeks, I seem to have gradually lost my sense of smell. To clear this severe cold I had to take Avamys. A couple of doctors I consulted said my nose and sinus seem to be inflammed, and there are some polyps in the nose. Now and then I seem to have the sense of smell. But almost always, it does not seem to exist. I am very worried about this. I was wondering if this kind of condition can be reversed, and if so what kind of procedure or medication usually is needed. I take asthma medication (Seretide 250/25) twice a day. I have no other medical problem. Blood tests are all fine. I seem to catch colds easily (or perhaps it is an allergy). Any guidance as to the type of tests I need to do redo and procedures that could be done.