Thank you both very much. I appreciate you taking the time to help me out.
Elevated blood sugar effects osmolality. This can cause migration of fluid into spaces causing pressure on the nerves. Think of a balloon filled with fluid pressing against a nerve passing through a small space. Passage of fluid into the surface of the balloon is mediated by osmolality. Interestingly, Metformin can relieve pain from pinched nerves in certain instances in non-diabetics by reducing fluid in spaces pressing against the nerves.
I am guessing at the reason but I know high BG increases nerve pain.
High BG makes the blood thicker thick blood does not flow as well so nerves get starved for O2..... I guess