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You didn't say how long! If it is a month or more you may need CT scan of your sinuses - to rule out any contributing underlying cause. Simple X-ray chest may also be necessary. Blood counts to see eosinophil
and blood sugar estimation are necessary
Asthma and/or allergic rhinitis
is highly likely - Did you consult a Chest and Ear Nose Throat specialist?
is usually a normal finding! But in your situation, fungus infection from steroid
use is a possibility. Vitamin B deficiency
may be contributing.
Your internist and ENT doctor will do the best. keep following up. It may take some time...
Wishing you speedy recovery