My ankle is killing me. Why? Please answer ?

During athletics we have to jump up and down off of wooden boxes and after about 10 minutes of that I felt it pop and it started hurting. There is no swelling or bruising. When I walk from one room to another I have to stop half way because of the horrible pain I am going through. My toes are really cold on this foot. My parents think it's nothing and won't take me to the doctor. I have elevated it and have iced it. It has not gotten better in 2 days. Please help me convince my parents to take me to the doctor.