Strike a Nerve

So after my check up with the doctor he is unsure what is causing the continued pain the left hip (now 6 months post op) and hasnt even ever heard of the heat in the feet sensation. He recommends I get an EMG, nerve conduction study done. Im continuing PT and starting some new exercises, actually got to try the elliptical for 5 minutes, watch out! Funny part is immediately after that the heat sensation switched back to my right foot! Now its over there again, strange!