I had nasal surgery where they excised part of the turbinates to open things up. Had a long-term sinus infection which went undiagnosed for 9 months, then 5 months of antibiotics, then the surgery. Long before the surgery I switched to a full face mask because I couldn't breathe through the nasal mask.

Unfortunately, it's nearly 4 years later and I have chronic sinus drain down the throat and trouble breathing through the nose regardless - even with using fluticasone spray.