my daughter is having episodes of where her vision will go black and blurred vision, she says she doesn t lose consciousness her eyes just go black, she had a slight headache yesterday but today this episode has happened 5 times and it usually lasts a couple minutes but her eyesight doesn t get very clear when its done her dr wants her to see an opthamologist, and they are doing an MRI tomorrow, they never did any blood work or anything and she is afraid to go to sleep fearing she won t wake up, do you have any ideas what may cause this, the dr told her it could be a tumor or aneurism but they didn t send her to a specialist, could you please offer some kind of answer so I can reassure her, her blood pressure she said was low today when she went in at 85/60. thank you