Last night at 9:30pm, my mom's memory was intact and by 8am this morning, she couldn't remember anything that happened in the last few weeks or so. She seemed physically fine, but started asking what day of the week it was multiple times, missed an appointment, and asked questions that seemed "strange." We took her to the emergency, got an MRI where it was established that no stroke had occurred. The doctor said, "this happens sometimes," and only offered stress as a possible cause. He did not point us to any direction. He said she will most likely gain her memory back, but if not, consult your primary care physician because there are things an MRI may miss, but did not offer what kinds of things an MRI may miss.
I hate to post this...however, you need to research EOAD...Early Onset Alzheimer's Disease. Granted, sudden onset of symptoms isn't typical, however, the symptoms are more aggressive and come on more quickly than with regular AD. Have you noticed any sluggishness with speech, loss of word to describe an object, misplacing objects, telling the same things over and over, "misplacing" car in parking lot, seeming comfused over simple things? This is a relatively new diagnosis, and difficult to sometimes find answers, but a good Neurologist can help diagnose.
On the other hand, TIA's (mini strokes) can be a cause of this as well.
Good luck, and keep us posted.
~mh
I was thinking the same thing as the above answer. Mini strokes can cause quick memory loss. If that is the case they should be able to find that through testing.
Maybe she had a little stroke, and can't say so because she doesn't remember.