How old are you? If you are 35+, then pre-menopause is certainly a possibility. (And don't let some quack tell you otherwise.) I have to say, that given where your problems were appearing (lower legs and feet) that the MRI was of your neck and head. Personally, I would have checked lower on the spine for problems. But...oh, wait...I'm not a doctor. I'm just going by common sense. (Ahem.)
Hi Bella, do you sit on the couch alot or at a desk? Could it be side effect from meds you are on? Sometimes the answer is simple and you need to be your own detective. good luck.