Random loss of limb function

Hello (SOS),
I am a husband to an amazing wife who has never had a drink of alcohol or smoked (non DM). She has always eaten healthy and kept fit with walking and netball. Height 5’3” and weighs a slender 48kg. Since the 24th NOVEMBER 2013, the wonderful mother of our three children began experiencing some strange symptoms.
Making some food in the kitchen she experienced stiffening in her arms. Then she felt like she was going to fall over, like her legs became wobbly and would give way. She called out to me and I laid her on the floor. Her body lost function (not sensation) from her neck down. Sometimes her body feels really weak and not stiff, and laying down is the only way to bring back function of her muscles (after 10-20 minutes). These come with the obvious fear that she may fall over.
She spent 7 days in hospital overseen by a neurologist. At each episode, testing of BP, HR, O2 and BGL’s was performed; they determined all results to be within normal limits. No notable abnormalities observed with MRI of her spine. EEG revealed she breathed out to much CO2 (????). A physio told her to use a paper bag to hyperventilate when she feels it coming which seems to reduce the severity of the episode about 80% of the time.
Cognitive function seems normal (apart from the obvious anxiety of the event) throughout an episode, though shaking (tremor like) of her limbs can be observed following. She also feels light headed when trying to sit up after. This all depletes energy from her body and she is extremely exhausted for the rest of the day. GP has prescribed strong antidepressants for her anxiety, though apart from these episodes she is functioning and feeling fine. We feel the anxiety is slowly growing due to the continuing of the episodes (approximately 2 episodes every 3-4 days) but so far has not started the meds. She is seeing a counselor who is helping with the anxiety, and says she appears to be well balanced.
In the last three or so months we have observed these experiences that seem to exacerbate the issue: Sometimes carrying our 2yr old on her hip creates the symptoms to come on. Chiropractor visits have not reduced symptoms and now carrying child less. Stress of children fighting and screaming in the home can trigger an episode. If she has a late night the symptoms are worse the next day. If she doesn’t eat a small healthy meal every two hours the symptoms are more likely to occur. She needs to have a nap through the day to manage to pick up kids from school and cook dinner at night and needs to lay down after doing grocery shopping. Some days it is the stressful worries on my mind that brings on an episode and other days there is a strange sensation at her hips prior to her legs giving way. Stronger symptoms happen around the time of menstruation. And she gets back pain and abdominal pains, with occasional headaches which is not normal for her.
She has an appt with a naturopath this week. Following this I am not sure where to turn. Has anyone heard of a similar case and hopefully treatment? Thanks for reading about our struggle.