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.
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.)