What Causes A Sore Throat And Fever Despite Taking Medications?

I was diagnosed with Strep throat exactly 6 days ago by rapid strep test at a local quick care facility. I was started on Cefdinir twice daily for ten days, and was advised to take ibuprofen as needed. Two days later my pain and fever was so much more intense that I hadn t been able to swallow any liquids at all and wound up in the hospital. They treated me with an IV of fluids, Antibiotics, Steroids, and a small amount of pain medication combined. They also did a CBC to make sure everything else was fine. hours later I felt fantastic. I was advised to continue the Cefdinir and was also prescribed Prednisone and Tylenol with codeine. even after taking my medication as directed (and doing all of the salt water gargling possible) I am back to feeling the exact same and still getting fevered every morning around 4 AM. I would like to know if there is anything else I should do to help this! thank you!