Knocked Out at a Gallop

I was out on the trails by myself conditioning my horse for an upcoming horse trials. She bucked when I was at a full gallop. I was completely unprepared for this because she never bucks, and because my stirrups were too long. I lost my balance and that is the last thing I remember.

I was unconscious for 15 minutes at least before I came to and called my mom. She was out on a walk and had seen my horse grazing back at the barn with a broken bridle. She was already out searching for me but had no clue where I was. I was taken to the hospital where they determined nothing was broken, but I had a severe concussion. My Troxel helmet helped to ensure that I didn't have more severe injuries.