Have you had a MRI done? My wife had symptoms just like yours,They told her she had MS. Six months later they finely did a MRI high enough on her back and found a tumor growing in her spinal column pressing on the nerves. She also has hardening of the arteries' witch causes lack of blood flow to the toes and fingers.
By the time they got it and did the operation she had perment nerve damage.
So I'm guessing when they do an MRI they focus on an area or could they do a full body scan? Another way to find MS is with a spinal tap, I don't care if it hurts as long as it answer my problem. Thought I could lighten it up a bit.