Long-term non-allergic chronic rhinitis / nothing helping

Hi there,

I developed a non-allergic chronic rhinitis some time five years ago. It appeared out of blue, and my nose has been blocked and runny ever since. I believe it significantly affects my breathing which, in its turn, affects my physical performance as well as sleep. There also must be a connection between this and the fact that I have been experiencing drowsiness, slowness of thought processes, and general brain fog.

I have tried to address this problem in many ways, including by using saline sprays, corticosteroids, antibiotics etc. No allergies whatsoever. Eventually, I was proposed to do a septoplasty, as my septum was slightly deviated. It was suggested that my breathing would significantly improve as a result, so I agreed. After the surgery, my breathing did improve for some time, but then the production of mucus re-started a few weeks/months after that.

At this point, I don't know what to do. I've tried most of the options to address this issue, but it seems there is no clear solution. My assumption is that I have a constant low-degree inflammation in my nose which restricts the airflow in the passageways. The surgery helped somewhat but didn't solve the primary issue of this inflammation.

Any suggestions as to what I could do? Personal experience?