Glad your OK.
Your right it can happen to anyone @ anytime.
This past weekend went to a little schooling show with a bunch of kids. I was riding a 7 yr old QH who I raised,broke out and trained. He was riding Western as he decided last year Dressage and Eventing was not what he wanted to do. I was dressed the part fringed chaps and all. But because I had students there could NOT wear the hat required to show western. Instead I had my helmet on. Practice what you preach. Good thing- Who knows why, mounted and within seconds he sat down ran backwards into a horse trailer sideways-which is where most of my injuries came from. 50 feet later with continued bucking,crow hopping,rearing. I decide to jump off=knee injury. Catch him, evaluate the situation-injuries are always worse with time- remount, horse stands, pick up reins walk off, go into warm-up fine, enter class fine, ride entire class places 3rd. Pain starts to catch up with me, scratch other classes. Who knows. I know I was lucky to be wearing my helmet.
Darren Chiacchia-Olympic and World Games Event rider- Had a horse flip over a preliminary jump on March 15, was in coma has progressed to a rehab center. After watching videos it was determined that his life was saved because of his helmet.