Can septal deviation cause chronic fatigue syndrome?

Today I was diagnosed with a septal deviation. My symptoms are mouth breathing while sleeping, a blocked left nostril, and chronic fatigue for several years despite plenty of sleep. The ENT feels the fatigue isn't related and considers the surgery elective as it is not not severely deviated. How often do you come across patients with septal deviations complaining about fatigue? What is the causal mechanism? Given my symptoms, is the risk of a septoplasty worth the potential benefits?