Five days of fever and back pain

Patient: I’ve had a fever for 5 days and my back is hurting as well. In the area of my kidneys it feels like a little kid is squeezing them. Just a light constant pressure,squeeze. Fever peaked at 102.7 on the 31st of March and never went under 99.3. Other than being a little fatigued the fever and back pain are the only symptoms. Any ideas?