Chronic bad breath since childhood, negative allergy tests, CT sinusitis, 30+ sneezes/day recently started. Could this all be connected?

Hi everyone,

I’m 31 and have had chronic bad breath since childhood. Over the years I’ve tried almost everything, but recently my nasal symptoms have become much worse and I’m wondering if everything is connected.

My symptoms:
Chronic bad breath since childhood.
Recurrent tonsil stones (sometimes hidden and come out when coughing or irrigating).
Persistent white-coated tongue.
Constant post-nasal drip (clear, white, or thin sticky mucus).
Sneezing fits of 10+ sneezes at a time, over 30 sneezes a day recently started this.
Runny nose after sneezing.
Sometimes itchy nose and itchy eyes.
Mouth breathing, especially while sleeping.
Ear popping/crackling/grinding, and I feel like my hearing has become slightly muffled.

Tests and ENT findings:

CT scan shows mild sinus
ENT diagnosed a deviated nasal septum (DNS) and recommended septoplasty.
Total IgE was normal (35 kIU/L).
Blood allergy tests for grass mix and house dust mix were negative (Class 0).
I know these blood tests don’t completely rule out allergies, but they make me wonder whether this could be non-allergic rhinitis, local allergic rhinitis, or something else.
I’ve also tested negative for H. pylori and SIBO.

For my bad breath I’ve tried:
Tongue scraping/gel.
SmartMouth, TheraBreath and other mouthwashes.
Oral probiotics.
Water flosser for tonsils.
Saline nasal rinses.
Diet changes (stopped dairy and sugar).

Despite all of this, the bad breath persists.
Has anyone had a similar combination of:
Chronic bad breath.
Post-nasal drip.
Tonsil stones.
Frequent sneezing despite negative allergy tests.
Ear crackling/Eustachian tube symptoms.
If you eventually got a diagnosis, what was it? Did septoplasty, tonsillectomy, or treatment for rhinitis actually improve your bad breath and post-nasal drip?
I’d really appreciate hearing from anyone who’s been through something similar