Suggest Treatment For Persistent Pain In Back And Hips

I have had back pain for many years, especially hip pain. For several months now pain has moved to both hips and down both legs. I have had 3 sinal epiderals, which helped minimally. My MRI shows spinal stenosis and spondylitis (severe). My neurosurgeon has said my only other option is spinal decompression and fusion. In some ways and some days, I have felt a little better, especially when walking, but sitting or standing still is pretty painful. I have had a few other possible symptoms such as cramping at night in my shins and feet, while standing, a feeling of pain, but not complete numbness in ball of foot. I have also noticed at times when getting up from chair I m a little off balance. I was also told my vertebra has slippage , dictating the spinal fusion. My question is, even though I have felt some relief when moving, are these other symptoms that it is either worsening or moving to other areas?