why does my right leg hurt sm?

I am 14F and my right leg has been hurting me to the point of tears for over a week..

It's only my right leg and the pain varies- sometimes its burning or throbbing or aching. I'm not too active, but I'm not underactive, I go on walks normally and occasionally play some sports. I haven't fallen or twisted my leg at all recently. I don't know what it could possibly be and nothing at all is helping. I've tried massaging it, heating pads, Tylenol, exercises and nothing ever helps. Now that I really think about it, I've had a lot of red flags recently when it comes to health. I've had severe appetite loss, unusual insomnia, jaw aches (my jaw will make popping noises whenever I move it), ghost pains, severe headaches, severe nausea and I haven't gotten my cycle in 3 months. These symptoms have been going on for about two months, does anyone have a clue what is going on with me? None of this is normal and it's got me really freaked out.