The bottoms of my feet hurt started with both legs feel week,along with sharp pain in both calf muscles,nqw my feet feel cold and tired all the time,I do hve some back prombles.I don't have diabetes or Arthritis so I been told could this be back problems that has spread to my feet.

I am no expert in this area, but it sounds similar to a problem that my mother has. She has back pain caused by pressure on the spinal nerve. Because those nerves end in her feet, she often feels sharp pain there. But, at any rate, you should see your doctor about it.