Pain in side

Hello Everyone
I would just like to know if anyone else has had a similar pain. I have a pain in my left side near my kidneys, sometimes it feels as though it extends down into my hip. The pain started out as intermittent and has increased to being fairly constant. I saw the GP today, she, tested my urine - no infection apparent. She suggested an ultrasound of my kidney and x-ray of my spine around the kidney region but otherwise has no suggestions as to what could be causing the pain. Janet M