I have been in severe pain over a month. I went to the emergency room once and they said it was something called flank pain and to follow up with doctor in a day or two. Could not go because of severe pain such as stabbing pain in middle part of stomach and middle back pain together. Sometimes I may feel like I have a fever with being cold and sweating at the same time. I might sleep 30 to 60 minutes after being in pain for a period of time. They ran some test but I have been in severe pain and unable to follow up with doctor. What could be wrong?