What To Do For The Pain In The Hip During Running?

Im a 15 year old girl and i am a distant runner and i haven't ran for quite a few days because of my hip. my hip hurts just whenever i try to run. also during school inbetween classes it kills and it hurts to walk sometimes. today it was feeling just fine 'til gym. in gym we are doing our 'track' unit and so i had to run today and i my hip was hurting all over again. it won't go away and i know i have to rest if i want it to heal and such and so i havn't been going to track practice at ALL this week. and i have a track meet on friday and everyone is countin on me to do good. i really wanna participate in it but i can't if my hip is in pain. What are some ways that i can help my hip?