Drink more fluids. Water helps loosen mucus and soothe an irritated throat. Dry, hacking coughs respond to honey in hot water, tea, or lemon juice. Do not give honey to children younger than 1 year of age. Elevate your head with extra pillows at night to ease a dry cough. Try a cough drop to soothe an irritated throat.
That is actually true to a certain extent. Most of the time you need to have some sort of sensitivity/allergy to dairy. But dairy products can increase the thickness of your phlegm, therefore can clog up your sinuses, and eventually cause the sinus pressure.
As for foods to avoid, those that often lead to itchy red skin include nuts, chocolate, fish, tomatoes, eggs, berries, soy, wheat, and milk. What to Eat for Sinus Congestion If you have sinusitis or nasal congestion, which is also called stuffy nose, drink hot liquids, such as tea or hot chicken soup.