Is the neuropathy caused by the stenosis? Are you in therapy for the stenosis? I know there are exercises for stenosis patients. In fact, one of the physical therapists I met while I was having PT for my bursitis has stenosis herself and she puts herself through stretching exercises every day. Before starting any kind of exercise, though, you should talk to your doctor.
Losing weight will help bring the blood sugar down and also help you be able to move around more easily. Eating very low carb will help bring the blood sugar down and help you lose weight. Exercise will do both, too. I'm not familiar with glyburide but I read that you could experience lows, so you have to test your blood sugar if you're changing your diet or activity. Speak to your doctor about that.
And your doctor: well, at this point, it seems to me your blood sugar should be controlled and if your doctor isn't being pro-active about your care, then I think you need to find another doctor. You cannot and should not accept these high blood sugar readings. Please don't be complacent about this. You can improve a lot of your health conditions yourself by changing your diet and doing some sort of exercise - but clear this with your doctor(s) first, of course. Do you have any kind of therapy for the stenosis?
You're too young to give up and resign yourself to a life of pain and limited movement.