Sharp pain in hip/back?

Hi, I am an 18 year old, healthy female. I have been carrying around a heavy backpack for college and it has made my back sore. Today, there has been a sharp, shooting pain on the left side of my lower back, near my hip, and I can feel a slight bulge there. When I move a certain way or take deep breaths the pain shoots down my left leg. What is this from and how can I get rid of it??? Should I go to a yoga class tomorrow?
 
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