My question is about pain and shaking.?

I am female, my age is 18. I don't drink a lot of caffeine or eat many sugary foods. My hands have been shaking on and off for a few days now. The is a persistent pain in my upper leg and lower back. The pain has been there for almost two weeks. My whole body has been shaking when I first wake up in the morning, and when I lay down to sleep. I've been have concentrating problems and It's hard for me to sleep. I know I should go to a doctor but I would really like to know if something wrong with me before I go?