My opinion is that it imay be a mistake for pre-diabetics to take insulin It may make you dependent on insulin brecause you body may stop making its own insulin because you are getting it externally. Diet and exercise in my opinion is a better solution.

I have been classified as pre-diebetic. My glucose and A1C readings are not too high. I aslo have numbness of the feet but not much pain , only discomfort. I took a class of Tai Chi which has improved my balance. There are also home exercises that you can do to improve your balance. These are the same exercises that you would get if you see a Physical Therapist.