Dry skin may not appear dry. Do you use a moisturizing lotion regularly on your feet? Also, has your doctor checked you for foot fungus?
Also, the sore tip of tongue could be a sign of Vitamin B12 deficiency. Ask your doctor to check your blood level of Vitamin B12 to see if it is low or low-normal. Anything under 400 warrents a supplement, and if it is under 200, you will need injections or the nasal gel (Nascobol) to get it back into the normal range quickly.
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Vitamin B12 deficiency can cause peripheral neuropathy also, so that would be another good reason to be checked for that. And while they're checking, ask for a Folic Acid test as well to make sure you aren't deficient in that one. These two - B12 & Folic Acid - are very important for proper nerve function.