Knot in my hip & pain that shoots down to my thigh?!

my left hip is sore and there is like i tiny knot and when I move my left leg the wrong way, all of a sudden it hurts in my thigh and I can barely walk or move my leg because it hurts so much. Sometimes it's fine even though if i press the knot i can feel the pain in the knot. But sometimes it hurts on my left hip and my left thigh if I move it wrong. I don't know what it is but I think my mom thinks I'm exaggerating which upsets me...

I went to the doctor today and got xrays but I don't know what's gonna happen yet. I went to school and had to walk up so many stairs and my leg was hurting so bad when I got home. I have school tomorrow and I don't know what to do! But I know that it will hurt very bad after all the stairs I have to walk up and down and all the walking.

Any idea what is wrong?