I am 14 years old, and I have recently been having very acute, sharp pains in the center of my back. I've had them approximately 7 seven times in the last three weeks, roughly. When I get them, my whole body feels paralyzed, and it is very difficult to breath. They only last about 4 or 5 seconds, and then die down, but they come in a series of 2 or 3. I have not had any previous injury to my back, like I mentioned this is very sudden.