I have a friend that she can be singing in the choir, and all of a sudden, she just stops, and stares and she doesn't realize she's doing it until some one tells her afterwards. It's been going on for a long time. She's had 2 accidents, from blanking out. She has went to 2 different surgeons, had numerous of test done, and they can't find out what is causing it. She hasn't had any head injurys, so it just started. She is really getting worried. She had her last one yesterday, at church while singing. Help!!