Avil (pheniramine) is an antihistamine that can cause dryness, which is likely what is irritating your throat. I recommend stopping Avil for now. To help soothe your throat, try staying well-hydrated with warm liquids. For your headache and back pain, a common over-the-counter reliever like paracetamol can help. Since your symptoms have lasted for a full week, please consult a healthcare professional for a proper evaluation so you can get the right care and start feeling better soon.
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What should I do if I have had a cold, headache, and back pain for a week, but taking Avil 25mg is irritating my throat?