Do I have kidney stones?

I have been having lower back pain (in the center below kidneys like menstral pains) for over a week and yesterday began having burning when I urinate and frequency however little urine excretion. I too have some pains randomly in my lower stomach area. These symptoms however come and go, for example when I wake up I feel great however two hours later it all comes back. I went to the doc and did a test, no infection or blood in my urine. Suggested that I go to a urologist, have an appt. in a week. I am however impatient and need some idea of what may be wront. Could it be kidney stones? Could it be intestinal? Please advise...