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You seem to be suffering from Upper Respiratory tract infection (URTI). At home, you can do warm saline gargles, steam inhalation. You should drink hot fluids like ginger tea, that will soothe the pain.
But in case you have fever then you should see your doctor who will examine you and prescribe an antibiotic like Azithromycin or Amoxycillin. You can continue Cetirizine that you are taking for net 2-3 days. In case of severe pain, you can add a tablet of Aspirin in water and do gargles with that. You may take Paracetamol on as or when required basis for fever and body pains.
Share my opinion with your doctor before you act upon it.
I hope it helps.
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