Based on your last post, it was recommended you go see your doctor for an MRI, at 34 you should have insurance that can cover this expenses. One of the possible causes of your neuropathy, was that you run 4mile per day, And exercising that much, and running is ultimately damaging to the body, especially the bone, muscle,nerves. Running everyday, doesnt allow your body to regenerate so you will eventually obtain complications from those issues.
paraneoplastic syndromes are different depending on what type of cancer you have. of cancer usually have other symptoms, but this is best done with an oncologist/hematologists.