What Doctor Should I Go To About Tingling And Numb

what doctor should I go to about tingling and numb feeling in both feet. This has come on for about 20 years. I have ignored it but now seek help. blood glucose runs 105. I have been diagnosed with lumbar stenosis. A visit to a back surgeon said I was not ready for surgery. I go to a gym and can back press 290 lbs. Standing for more than 5-10 minutes causes an ache in my lower back.