Hi, this is to help a person who doesn't have CFS, but sudden falling seems like a symptom that some with OI/CFS would have. A friend of my mother, in her 70s, recently had a bad fall and broke her arm while out walking. She's very active, but has always a had a falling problem. She has low blood pressure, which no doctor has ever been concerned about. She doesn't remember falling, just walking then suddenly being on the ground. Does this happen to some of you with OI? My OI is pretty bad but never comes on that suddenly. I always get some warning that it's time to get to the ground or a piece of furniture, by feeling light headed or weak. If you have this problem, do you have anything that helps with it or anything you can do to keep safer? Thanks! This person is very kind and understanding about CFS as, fortunately, a lot of people I know are.