Why am I having constant ankle pain?

I'm in lacrosse season right now and for several weeks I have had constant ankle pain. It hurts all the time and especially when I walk. I can barely go up and down stairs. It especially hurts at night for some reason to the point I can't sleep. Also practice is living hell if I don't take 3 Advil before. It's getting to the point I can't stand it anymore. I've been pushing through it but it's only getting worse. The athletic trainer at my school says it's from playing on turf and has me ice it every day but it's not helping (and she never takes me seriously so idk if she's right). I'm 14 by the way. If anyone thinks they know the problem or a solution please help!!!! I really need it! My mom is not taking me to a doctor.