Yes, your symptoms are very common and I understand how frustrating it can be when they keep coming back. Sinusitis and pharyngitis can both be triggered by allergies, especially if you're reacting to dust, pollen, or environmental irritants. Allergy causes inflammation in the nose and throat, leading to mucus buildup (sinusitis) and irritation in the throat (pharyngitis). At the same time, acid reflux, especially a form called silent reflux (LPR), can aggravate these conditions. The acid from your stomach can reach your throat and cause persistent irritation, soreness, and even trouble swallowing. That's why when you take anti-allergy tablets and Pan 40 D (acid suppression) together, your symptoms improve. But when you stop them, the symptoms return—because both factors may be contributing.

It may be due to allergy. Skin prick test you can do. Ct nose and pns will help

You need a thorough evaluation of nose and throat. Get a nasal endoscopy and CT evaluation. The PND might be causing irritation in the throat. For the reflux, take precautions like avoiding tea and coffee. Avoid spicy and oily food.

It's allergy. please get done skin prick allergy test to know allergen.