What could cause temporary blindness?

I had the flu for about 4 days (my daughter had the typical flu a few days prior) but with no vomiting only nausea, fever, increased thirst, stomach upset and minimal diahrrea. I felt like crap but i thought it must be almost over. I woke up at 6am because i heard my son vomiting. I walked to the kitchen got him a bucket, came to his room and held it for him to puke into. I didnt run or anything. And I felt fine (besides getting over the stomach flu). Then all of a sudden I couldnt see anything. I kept blinking and nothing just all black and white dots. mostly black. I couldnt see any objects, light or dark. Then I called for my husband and tried to find my way to my room to lay down. I ended up fumbling my way into my daughters room...totally lost. My husband tried to walk me back to my room which felt like forever. After laying down for 15 min I could see again. After I layed down it sounded like there were two running taps on either side of my head. Eventually it got quieter and then I think I fell asleep. My husband also said my eyes were cross eyed. The next day my neck was very stiff. It was very scary. I drank almost a full bottle of gatorade the day before and was trying to keep drinking water. I am glad it is over. Any ideas what this may have been caused by? Also when my daughter (3yr) was getting better from the flu she had blue fingernails and blue lips. Dont know if that is related. My husband is away now and my son is sick so i cant go in to see a doctor right away.