Painful Arch

Hi can anyone shed any light, on Sat I went for a 12 mile run, the first half was mainly down hill the second half was mainly uphill "strange that", on the way out my right foot felt uncomfortable in my trainers I could not seam to get the laces and tounge sitting comfortably over where my anckle bends on the front of my foot, after about 8 miles I began to feel a pain in the top of my arch so Islowed down and made my way home, I rested sunday and tried a short run on monday and still have the pain, any ideas ?