Your symptoms suggest your nasal passages are sensitive to the cold, dry air from the AC or fan, which is common in allergic or vasomotor rhinitis. For oral relief, a daily non-drowsy antihistamine like cetirizine or fexofenadine can help. Alternatively, montelukast is an oral prescription medication highly effective for nighttime congestion. Please be cautious if your current nasal spray is an over-the-counter decongestant; using it for more than 5 consecutive days can actually worsen congestion (rebound effect). Using a simple saline nasal spray or a bedroom humidifier can also soothe your airway. I highly recommend consulting a doctor to safely evaluate your symptoms and tailor your treatment.

Your nose blockage with AC exposure is likely due to allergic or non-allergic rhinitis, where cold, dry air irritates the nasal lining and causes swelling. Frequent use of decongestant nasal sprays can also cause rebound blockage if used for many days. Try using a saline nasal spray regularly, keep the room air slightly humid, and avoid direct AC airflow on your face. If symptoms persist, a doctor may prescribe an anti-allergy tablet or a steroid nasal spray for longer control. Avoid using regular decongestant sprays for more than 3-5 days continuously.

This is a common condition called ear barotrauma, caused by pressure imbalances behind your eardrum during descent. To prevent this, try yawning, chewing gum, or swallowing frequently. You can also gently blow your nose while pinching your nostrils closed. For medication, using a nasal decongestant spray containing oxymetazoline or taking an oral decongestant like pseudoephedrine 30 minutes before descending can help open your Eustachian tubes. Standard ear drops are generally not effective because the issue is behind the eardrum, but over-the-counter pain relievers like ibuprofen can help manage discomfort. If pain persists after descending, please see a healthcare professional.

Occasional bleeding from both nostrils, known as Epistaxis, can happen due to dry nasal passages, nose picking, allergies, sinus infection, high blood pressure, or irritation of the delicate blood vessels inside the nose. In many cases it is mild and stops on its own. Keeping the nose moist with saline drops, avoiding nose picking, and staying well hydrated may help prevent it.