The symptoms you describe sound like diabetic associated nerve damage which happens over time as a consequence of high sugar levels, although sometimes there can be other causes which would need to be excluded. The diabetic associated nerve damage can be difficult to treat, but if sugar levels are high, then these need to be brought down. One also needs to have blood pressure treated specifically with what is called an ACE inhibitor, and if one of the fats in the blood called triglycerides is raised, then this needs to be treated with a drug called a fibrate. If after the aforementioned treatments have been instituted and you still have altered sensitivity, and if it is painful, then there are medications which can be tried, but you would need to discuss these with your doctor.
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