Crepitus in neck, off balance and both arms weak. x-ray shows nothing except unusual reversal of the lordosis and kyphosis? causes for my problems?

You may need an : evaluation by a neurologist, neurosurgeon or Orthopaedic surgeon for a complete examination and possible MRI of the cervical spine to rule out possible causes like a disc herniation, spinal stenosis or both or other issues involving the spinal cord such as myleomalacia or scarring or even a syringomyelia which may signify other issues.