I so appreciate your humor!😁 But I do commiserate with your situation.
I've had sinus issues for years...CAT scans, etc. have not revealed sinus cavity problems except that I do have a deviated septum (but that was revealed to me decades ago). The last ENT that I went to 5 yrs ago was CHOSEN due to his outstanding credentials and because his bio emphasized his extensive research and published work on anything and everything related to sinuses! I was so excited, thinking that finally I'd get release from the nastiness that my sinuses caused. But no. After intrusive (and painful) instruments were used (the deviation "was in the way"), he announced there was nothing wrong, so he ordered a CAT scan. Again told me that nothing showed on the scans. "But I can send you to a surgeon," he offered. Seriously? A surgeon when there was NOTHING wrong?? I left. It's been 5 yrs since that wasted experience and the problems exist. Actually, the problem became scary back in March when I had 4 episodes of sudden, heavy nosebleeds (and trips to 3 different hospitals and a surgical otolaryngologist who cauterized within the left nostril to stop the bleeding). As I write this, I've been sniffling and experience the usual sinus stuff.... But I have not had brain fog from the condition.
I know all too well how overwhelming it can be to have health issues that doctors can't explain, can't provide means of relief. Worse yet, can't promise that there is a cure. I'm going through all of that now. So yes, the wishy-washiness of your doctors' ping-ponged responses definitely affect you in the manner that you've explained.

I'll offer you what has helped bring some relief, advice given by two of the specialists that attended to me back in March: Maintain a cool mist humidifier in your room at night. We bought one for the family room also since it is adjacent to my office. It's important to keep sinus cavities from drying out. I don't run the one in the family room all day, just for periods of time. We also have air purifiers: one in the bedroom, and two on the first floor of the house. The air smells differently (fresher, sweeter) since incorporating the purifiers. Highly recommend BlueAir 411. Size needed depends on dimensions of the area in which it will be placed. The cool mist humidifier brand: Midea SC350. I use Ayr Saline Nasal Spray as needed. And I aim to stay hydrated. Warm compresses over the eyes and sinus areas are so comforting. Avoid having air (from AC vents in car or fans in house) blow on your face. I've not had nose bleeds since that awful month of March, thank goodness. And we still wear masks (being in mid seventies and coping with autoimmune disorders requires not taking chances).
I hope you can find relief. Dealing with "unknowns" is definitely mentally and physically taxing.🌺