My right calf was hit from behind by a dog running full speed. I was told I looked like one of those cartoon characters that slipped on a banana peel. I went airborne, parallel to the ground about 3 feet high and landed flat on my back and head. When my friend came to check on me, she said I just laid there blinking for about 3 seconds not responding to anything. My neck hurts to tilt it and the back of my head is really sore. Is it possible that I have a concussion? My ankle is slightly swollen and red with a few gravel abrasions. I can t walk on it at all unless it s tightly wrapped. Even then, it s a slow painful shuffle. It is possible to break a fibula this way?