You need to make sure you continue to eat low glycemic foods to keep your glucose levels down. At 5.7, you'd still be pre-diabetic, but you can lower that even more. You don't mention any exercise. That can go a long way toward helping to keep glucose levels in check.
As for the dry feet - it's winter time and dry skin is normal this time of year. Beyond that, there are other conditions that cause dry skin, such as hypothyroidism and dehydration. Have you tried putting a moisturizing lotion/cream on your feet to see if it helps the itching? You should moisturize your skin a couple of times/day during winter, more if you're not drinking enough water to stay hydrated.
I have hypothyroidism, along with pre-diabetes - add in winter and the bottoms of my feet are cracked in numerous places because I haven't moisturized enough. You might give it a try for a few days and see if it helps.