I Want to know

I had to go and pick Marcus up from school today around noon. He was and still is in a lot of pain. Now his knee is stiff and hurting also but who knows if there is an issue with it or if it is just from the way he has been walking the last couple of days. I called SLCH and they told me to take him to his ped in the morning then have the doctor call them.
I hate this so much!! I want to know what is wrong with my child.