I’ve had a fever for 5 days despite antibiotics

22F, 245 lbs 5’3” diagnosed with strep but then told i also may have a viral infection. I’ve been taking amoxicillin 875 mg twice a day since Sunday and around the clock Advil and Tylenol. I went back to the doctor on Tuesday and she thought it was maybe viral so she prescribed me prednisone. I’ve had a fever consistently (except when I double up on fever reducers) for the past 5 days and a terrible 7/10 headache for the last 4 days that sometimes doesn’t even respond to pain meds. At this point I don’t know what to do. Any advice?