Allergies or strep? antibiotics not working

Patient: What felt like allergies started 10 days ago. post nasal drip and one single sore in throat…just one. after 7 days it did not get better with zyrtec and cingulair. Went to doc and she quickly said it was strep throat even with out a swab test. I disagreed. She gave me augmentin 500…Have been on it for 3 full days and feel the same. no fever, but like I’m in a cloud and the sore on my throat is still there.. still post nasal drip…any help?thanks