I was doing roundoff backhandspring tucks on the mat at my tumbling private. I tumbled for an hour by myself and I was so tired. I kept landing short and it would really hurt my ankles. I then kept trying and the next day the outside of my leg like 5-6 inches about my ankle hurts really bad when I jump, run, tumble, and it is tender to touch. My athletic trainer at school told me it could possibly be a fibula stress fracture. What do you think?