Yes,it is true that sinusitis if chronic(for more than 12 weeks) can lead to fatigue and general aches and malaise. Chronic sinusitis can cause difficulty breathing
through the nose, pressure-pain
in the nose, thick nasal discharge, reduced sense of smell, aching in the upper jaw or teeth, bad breath, post-nasal drip, and persistent coughing.
First of all, the diagnosis of sinusitis or sinus infection has to be confirmed.