Sinus issues, along with a runny nose, sore throat, body aches, weakness, and dizziness, are common during viral infections, sinus inflammation, seasonal allergies, or the flu. When your nose and sinuses are blocked, you might feel pressure in your head and ears, which can cause dizziness or a heavy feeling. Not sleeping well, not drinking enough fluids, and eating less during an illness can also make you feel weak and tired. Drinking warm fluids, inhaling steam, getting plenty of rest, and staying hydrated can help loosen mucus and soothe your throat. Medicines for congestion, fever, allergies, or infections may be needed, but only take them after checking with your doctor, especially if you have high blood pressure, diabetes, or other health conditions. If you have a high fever, trouble breathing, severe facial pain, ear blockage, vomiting, chest pain, or worsening dizziness, consult your doctor.