I guess you are lucky. I had a fall which could had taken me to ER. It happened when I was relatively new to road bike and tried to enter a drive way like a car. Wheel of my bike trammed along the road and sidewalk (about 2 inches high). I lost balance, took a fall on concrete sidewalk. Right side of my helmet took the hit. The impact was severe enough, it was dark (not pitch dark) in front of my eyes for next few seconds. However, I was able to bike back after 15 mins of rest. I can't imagine doing that without the helmet.