I was sitting on a chair and my friend was pulling me backwards. Another friend grabbed my feet and I flung up into the air and landed on my back. I had a bit of pain next to my spine but not that bad. After school that day I was juggling a football and doing tricks. When I attempted a harder trick though it sent a jolt of pain up my back. The next day I tryed to do basic tricks but it hurt my back. A bone in my back feels wobbly and loose. I don't know wether to rest it completely or should I stretch it. Is it bruised or fractured? Should I see a doctor?