Hello, Welcome to HCM, The conditions which can leads to recurrent throat infection are exposure to allergens,dryness of the throat, irritants,gastroesophageal reflux disease (GERD) viral infections and bacterial infections. As you have taken three course of antibiotics the symptoms are may not be due to bacterial infection, you need to identify whether any of the above conditions is causing your symptoms and treat that root cause which is affecting your throat. For present symptoms I would like suggest 1.Steam inhalation 2.Salt water gargeling 3.Throat soothers 4. Oral Antihistamines. Your condition will improve with these remedies, but the root cause for your symptoms should be identified and treated properly to prevent recurrence. Thank you.