Im 14 years old, and i woke up and my LOWER BACK IS KILLING ME!!?

ok, so i have scoliosis, which makes me slouch. last night i was up till 1 am reading a book, and today i woke up, and i didnt even go to school, my lower back hurt so badly. i cant even walk!! i play tennis very competitively, and i have a national tournament comming up, so i need to get better soon!can anyone help me as to what to do, pain relievers, and anything else helps :) thanks