The term "increased dosage of medications" is a completely meaningless statement. What were the medications and the doses?
The cholesterol levels are meaningless.
As Super_sally888 stated high glucose levels damage nerves.
The high hba1c is not good news, and this person's blood sugars do need to be controlled. His average blood sugar is around 300, when a normal average blood sugar is 100 or below.
High blood sugar causes damage to nerves, with damage known to occur with blood sugars higher than about 140.
This person should be on insulin appropriately dosed (Basal-bolus dosing - adjusted to food and exercise levels).