As long as i am sitting i am fine, but when i get up walk just a little my insides and outside shakes. my back hurt in the lower back, ?

Back pain and shakes: Shaking makes me think of anxiety conditions however the back pain makes that less likely. I would focus on your back perhaps starting with x-rays of the area that hurts. We would want to make sure that you don't have spinal stenosis, alkalosing spondylitis, severe osteoarthritis of the spine or some other condition in which the nerves in the spinal canal have become compressed.