Anyone? Any advice would be great!
Ask your teacher, he is responsible to help you on exactly these problems.
When you say that your hand hurts i assume that you use your weak muscles to play those thirds and chords at the prelude intro. Another reason maybe is to have a ccccc, experiment a little with motions that make them easy to play at a comfortable speed. Now, those meters are played by hands loosely bouncing at the wrists while your upper arms suppourt the movement. Another tip is to try to play them soft, concentrate on relaxation then when you are ready deal with technique and speed.