Are you also doing Ivermectin (body weight dosage) every day until the thing clears? It can't hurt and may be the clincher you need.

Note: You are doing the nasal spray, but why not also do a general daily sinus rinse to flush out what's inside the sinus cavity and the back of the throat?

I use what I have at home which is a gravy boat, distilled water and Himalayan salt. I warm the salty water for 10 seconds in the microwave and lean over the kitchen sink and place the spout of the gravy boat up to one nostril and slowly sniff it in and then spit out the salty water that rolls down my throat. Do each side until you have to blow your nose. Blow thoroughly and then repeat. Keep going until nothing but water blows out.

Follow this with Q-tips to swab down the interior until clean and dry. Then, use your nasal spray. I guarantee it will improve things!

Also, you are taking the right vitamins for sure, but are you taking enough each day? Why not ramp the dosage up?

Consider this dosage every day until it clears. Can be split into 2 doses.

D3 - 10,000 IU

C - 10,000 mg

Zinc - 100 mg

Quercetin - 1600 mg

NAC - 1200 mg

Turmeric - 2400 mg

Melatonin - 12 mg (at night)

Good luck!