SIUK - shin splints - foam roll the calves (outer, back and inner) the quads, hams and IT band twice a day. Get a proper massage. Loads of stretching (especially the calves). Do the yoga child pose to stretch the front of the ankle and shin area. Do big circles with your feet to keep the ankles flexible. Buy new shoes if your's are old. Run off road more than on the road. Get calf compression sleeves.
Today was 17 miles with the last 5 @ MP followed by 25 miles on the MTB. Cold out there today!