How often will chronic sinusitis return?

Hello doctor,

I was diagnosed with chronic sinusitis without polyps two years back. Then, I had congestion, pain, throbbing, postnasal drip, weak sense of smell and taste, dizziness, cough, tinnitus in my left ear, and eustachian tube dysfunction. My ENT suggested me to undergo a CT scan and scope. He said I had a mild disease in my maxillary and ethmoid sinuses only. No pus or infection and no blocked sinuses. He said I had a mildly deviated septum but that it does not require surgery. He prescribed me Budesonide rinses two times a day. I was tested for airborne allergies, but that test was negative. I do not have asthma. My symptoms are gone except for a weak sense of smell, tinnitus in the left ear, and very mild Eustachian tube dysfunction. I have had a good response to treatment. My questions are, does the sense of smell eventually return or improve? Sometimes my sense of smell fluctuates and improves but not for long. How often will chronic sinusitis return? Thank you.