My mother is 67 years old. For about the last two years she has been experiencing strange symptoms a couple of times a month that last about 30 minutes to about an hour. Not all the symptoms come each time. She gets weakness in all of her limbs, balance problems, sometimes she can't move her limbs, sometimes she can't get into bed, she has difficulty communicating a complete sentence or thought, feels very scared during these "attacks". In addition, she has been getting increasingly reclusive. She doesn't want to leave the house and she is irritable.
Any ideas what these strange symptoms could be?