I'm sorry to hear you're experiencing a severe cold. Here are some steps you can take to help manage your symptoms:

• Rest and Hydration: Ensure you get plenty of rest and drink fluids like warm water, herbal teas, or soups to stay hydrated and soothe your throat.
• Symptom Relief: Over-the-counter medications such as antihistamines can help if your cold symptoms include a runny or itchy nose. For example, cetirizine is an antihistamine that may relieve allergy-related symptoms, but it should be taken only under a doctor's guidance.
• Home Remedies: Use a humidifier or inhale steam to ease nasal congestion. Gargling with warm salt water can help soothe a sore throat.
• Avoid Irritants: Stay away from smoke, strong perfumes, or other irritants that can worsen symptoms.

If your symptoms worsen, persist beyond 7-10 days, or you experience high fever, difficulty breathing, or chest pain, please consult a general physician or an ear, nose, and throat (ENT) specialist promptly.

For personalized treatment, especially if you consider medication like cetirizine, please consult a doctor to ensure it is safe and appropriate for you. If you feel very unwell or have emergency symptoms, contact emergency services immediately.To narrow down potential causes, we will need some more information.Please tell me your age and gender.