Hello, Hope you're not in too much of pain. This is not a common problem that you've faced but the condition now you're facing might be a common problem As you said if the pain is radiating then you need to undergo an X- ray of your spine with the guidance of a orthopedic doctor. As you also said that you have pain on where your kidneys lay and also sometime there is abdominal pain. Let's talk about kidneys. Now if you have any problem related to kidneys you will be finding some symptoms like red colored urine or yellowish urine, pain radiating to the groin region from lateral side, vomiting, high degrade fever with chills. So if you have Amy of the above symptom associated then you may consult a urologist. Abdominal pain is very vague term to say so it has to be evaluated for knowing the cause for this you need to consult an General physician first. I hope I've cleared your doubts to which doctor to consult. Kindly proceed accordingly. Thank you. Take care.