Sudden weight loss. Unexplained loss of 20 pounds. Blurred vision in left eye. Major weakness in legs to the point I have to use a walker. This as all happen in a month. went on vacation with my wife and I was fine. We walked all over the place and I usually walk 2 miles a day. Come home and 2 weeks later I am in this shape. Went to eye doctor. Found nothing. Been to Neuro and had MRI and no brain cancer or tumor found.