When I move around I can't see for a little while, and lose my balance. My hearing also does strange things. Sometimes it's longer than other times. It isn't just when I stand up or stretch though. I have passed out twice because of this. When I went to the doctor they tested my heart with an ekg. They can't find anything wrong with me. They even tested me to see if I was anemic; which I wasn't. It is just so annoying to know that you have a problem but no one seems to know what it is.