Hello!
Since kidney is the organ that excrete urine, so if there is no urine, maybe there is something wrong with your kidney function. You have a fever so i think maybe your kidney get infected. You need to do some test to detect your blood as well as urine, and ask your doctors asap. because kidney disease cannot be treated well if it lasts for rather a long time, and in some cases, the kidney function will deteriorate quite quickly.