Suggest Treatment For Numbness In Right Calf,ankle And Foot

My name is Donna, and I am a 70 year old female in excellent health. About 1 year ago I started having numbness in my right calf, ankle, foot, and toes and swelling as the day progresses. I tried pt and other options suggested by my doctor, but none have helped. At this time it has gotten worse, and makes walking and driving not so safe. I was told it was because of my back pain issues, but Neurosurgery said a spinal fushion would help my back pain but won t help the numbness problems I have mentioned. Any ideas on what may help? Thanks Donna