Is this serious? I'm only 17 and my is constantly hurting me, sometimes to the point that I cannot move, I have no insurance so I can't see a doctor and its starting to get worse along with other pains mainly in my head and nausea. I'm at a normal weight an

It's. It's really hard to tell you without an exam since the differential diagnosis includes things as mundane as a spasming muscle, a kidney stone (although very unlikely in a 17 year old), or ruptured disk in your spine. Your local emergency room cannot turn you away for lack of insurance. I'd strongly consider you take my advice and get this checked out sooner than later.