Hi I am 17 years old and I have very stong back pains it only happens when I am moving around. Also when I go to sleep I have to sleep with my nees up because I have my legs down then my lower back and my lower stomach haves pains. My ribs also hurts to it feels like some one keeps hitting me in my ribs but from the inside. I have bben to different doctors for urine test blood work exams and thy say its nothing but I think it is somthing horrible. I was reading about the kidney stones and stomach tumors and kindey tumors and I am really worried that have those things.what should I do?I am so scared and I have so many questions about why am I having these pains. Can someone help me please I need help befor something goes wrong.