I have the exact problem. I have stabbing pain in my left side the whole way through to my kidneys. My lower back kills me. I also get pain in my legs a lot. This has been going on for months. They sent me for a test for Diverticulitus but it was negative. I have no fever, still have an appetite, doesn't get worse with any specific type of food that I eat. My pain comes and goes with severity but is always at least a dull ache. I had problems with an ovary and endometriosis and they thought that may be radiating the pain...but I had the ovary removed in May and the pain came back. Last week they did a Catscan of my kidneys looking for stones and it was negative. I am back to the Dr. tomorrow and they are going to send me for lower GI stuff again...