M.L.
Agree with the chiropractor. Might just need an adjustment. My daughter's back was killing her, (at age 10), and, it turned out her spine was slightly shifted in the pelvic area. 2 visits and she has not had pain since.
Also- as a dancer / dance teacher, I know how important it is for your core muscles to be strong in order to support you properly. Make sure you are doing some abdominal exercises. This will help strengthen your core, and, help support your back. Our bodies are meant to move and groove, so, if you have not been exercising, at least 10 minutes daily, find some time to do it. It is important in order for your body to work the way it should. ;)
Pilates is the best IMO.