Severe Leg Aches: Seeking Advice

I'm having such bad leg aches today. I slept so bad last night... I tried taking Ibuprofen and Tylenol but the pain won't stop... I've been having these pains since I was very little and my parents are convinced they are growing pains but it's never the other leg. It starts in my hip and hurts slightly less down my thigh to my knee where it hurts the most then again hurts a little bit down my calf then my ankle throbs. Does anyone know what could be wrong? I've had lots of blood work done and no one ever seems to know what's wrong.