Lower back pain, cramping legs, headaches...?

I wrote a question on here before because I had really bad lower back pain so severe it hurt to move or walk and advil/tylenol wasn't working. The next morning it dissapeared completely. That night I had cramping, sore legs at night (like the back of my legs like calves) and I was wondering if that's related? It seems to be mainly at night that they hurt. I also keep getting dizzy and getting headache. Is this a coincidence :s I'm 15. I'm a girl.