Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have cold, headache, lot of phlegm and pain below nose which is because of increased susceptibility of getting infected because of compromised immunity which is leading to common cold. Need not to worry about it. You should use anti inflammatory medications such as Levocitriziine along with antibiotic such as Levofloxacin. Avoid exposure to allergens such as dust. You should avoid cold carbonated beverages. Take meftal P for fever. Take diet rich in multivitamins along with vitamin C pellet to booster immunity. You should use mist humidifiers in room. Visit ENT specialist once if symptoms keeps on persisting and get examined. Start treatment after prescription. You should take probiotics in diet. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari