hi im males age 14 and i have upper back problems about 2 years ago i was at an amusment park waiting to go on a ride and i sneezed and i have very severe pain in my back i went to the docter and he said i proboubly just pulled a mustle and i has some friends walk on and massage my back and it went away...but then a few days later it was back. it comes and goes every few weeks and i havent done anything to make it hurt plz tell me wats wrong. ty