For your symptoms, likely a common cold, you can use over-the-counter medications for relief. To clear your blocked nose, try a decongestant like pseudoephedrine or a nasal spray like oxymetazoline (use the spray for a maximum of 3 days to avoid rebound congestion). For sneezing, an antihistamine like cetirizine or loratadine will help. For your sore throat, take pain relievers like paracetamol or ibuprofen, and use throat lozenges. Stay well-hydrated and rest. If you develop a high fever, difficulty breathing, or if symptoms last longer than 10 days, please see a doctor for a physical examination.