I found this info on kidney stone symptoms, and except for the blood in the urine, I think it's what floored me on Friday:
People who have kidney stones often describe the pain as excruciating. The lower back, abdomen, and sides are frequent sites of pain and cramping. Those who have kidney stones may see blood in their urine. Fever and chills are present when there is an infection. Seek prompt medical treatment in the event of these symptoms.