What Causes Numbness In Lower Extremities, Blurred Vision, Dizziness And Extreme Fatigue?

I m trying to help my friend who has a series of inexplicable symptoms since May 2015. She is now hospitalised but tests so far haven t got to the bottom of her illness. It started with numbness down her right side, then spots at various places eg her shoulder, arm, leg, foot. By July she began to experience blurred vision, eyes not focussing together, dizziness as if under the influence of alcohol, weakness, extreme fatigue, needs walking sticks to support her balance. She already has Coeliac s disease so is on a gluten free diet, drinks no alcohol or caffeine, has a mainly vegetarian diet with fish very occasionally, doesn t smoke, lives a healthy life-style in a very clean part of Northern Scotland ie little pollution, lots of sea air etc. I am very concerned about her. I visited her today in hospital and am troubled that the MRI scans, CT scans, copious blood tests etc haven t reached any concrete diagnosis apart from today they wonder if there is something in one of her lungs. her voice is husky, unusual for her but she doesn t have a cough.