Problems during my period

I'm 17, a virgin, and have pretty bad periods. I usually get back pains, cramps, cravings, the usual. I guess its my change of life style that changes the times of my periods but it hasn't changed much at all, except I go gym now. Also there is something else that has recently occurred. I suddenly have very painful back pains, at the lower part of my back up my spine. I have a crooked spine which I have been going to gym to straighten it, but it hasn't hurt in a while so I know the problem isn't how I've been sitting or sleeping. I get headaches much faster when in the sun, and last longer too. And in the car I was even more car sick then I usually am, I had to hop out of the car before I threw up. I have also noticed that I am weak, meaning I cannot move fast and I am sleepy.

Could there be any reasons for this? Any medication needed?

Many thanks!