I am a14 years old girl, and for the past month i have had unusual back pain in the middle/upper back and i was told it was due to growing. Just last week i fell down the stairs and had gotten a really big bruise on the lower part of my back. And now my back pain is worse, i ve been getting lightheaded if i sit up or stand up for more than 30 minutes, and when i lay down there is no position where the pain will stop, also at night i ve been getting muscle jerks in my back as well, what will help?