Hi, anyone know anything about Sciatica and ways to relieve it?

I’m a dancer and I exercise every day and I’m only 17. I’m being treated for tightness with the lower back muscles which attach to the spine but that is incorrect. The pain starts in my right buttock and travels down to the top/ middle of my calf. I can’t move my leg back and it hurts to put my left leg any higher than 15•... Obviously this is an issue as I am a ballet dancer. What can I do???