You said your hip has acted up before - I think you need a thorough investigation of this, like an MRI. You're very young to be having hip pain. Another thing to look at is - a problem in another area, like your back or knee can make your body move differently which can overload your hip. Look in a full length mirror and see if your shoulders and hands are level - is one shoulder ligher than the other? There's also some good hip stretches you could do, but I would be afraid it might make it worse, since we don't know the exacxt cause of the pain. Have you had your vitamin D levels measured? Insist for an MRI and I hope you feel better.