On August 24, 2010 (Tuesday!!) my mom called at 10:50am saying she didn't recognize her surroundings or know the date. I had spoken to her at 10:00am and she was perfectly normal. While scary at first, as soon as she was checked into the ER, it was apparent she hadn't had a stroke or anything more serious and was quickly diagnosed with suffering from Transient Global Amnesia.
This video is a small snippet of the looping conversation we had for around 9.5 hours. She was a great sport and in good spirits. She was not in any pain.
Transient Global Amnesia (TGA) generally lasts from 1 - 24 hours (and in my mom's case she recovered fully in around 26 hours) and have no aftereffects. Full memory is recovered (though she cannot remember having the amnesia) and it likely will not occur again.
Cat Scans, an MRI, MRA and various other tests were done and she did not suffer a stroke or any other trauma.
If you would like to learn more about TGA, click the link below.