Hi, with this presentation, I think there is need to rule out the possibility of a kidney
stone. With a kidney stone, there is severe, colicky pain on the side, radiating towards the groin and hip. Complications at the level of the kidney can cause the pain to be permanent. If I were your treating doctor, I would ask for Intravenous urography for an X-ray could still be normal if the stone is radio-transparent.
I hope I have answered your query
I wish you good health