1. answered already- but did they take one from your ankle as well?
2.yes, that is part of sfn
3.very good answer above. Very important to know if you are pre diabetic.
4. I don't think you can make it worse by doing to much. I think we should do what ever we can and listen to our bodies. I rest when there is pain or in-between activities to recharge.
5.yes, sfn and neuropathy can precede a later diagnosis of many autoimmune diseases.

Good luck and I hope they can figure it out!