Even though your diabetes is under great control now, it can take many months or years for the damage to heal if the cause was the elavated blood sugars, [ a very likely suspect] an A1c of 13.7 is extreemly high and who knows how long those sugar levels were running at that level before being diagnosed with diabetes.
The spine issues should be checked out properly as well, to see if it is a cause or contributing factor, I can't understand the docs saying it could be this or that, why don't they find out for sure with appropiate testing, those supplements MrsD suggested are an excellent choice, something I would be getting onto very quickly, the nerves take ages to regenerate once the cause is taken away, nothing happens overnight.

good luck