Does the presence of balance problems point towards a more specific, underlying cause of one's CFS (i.e. where testing should possibly be directed) .. or is this just a fairly common symptom? I'm surprised no doctors I've seen have taken this very seriously, since it renders me effectively physically disabled (at just 30); I can't walk more than 10-15 meters without feeling like I'm going to keel over. I have had a brain MRI which was clear, and a neurologist said it was probably just stress (!), whereas my own GP recommends exercising (okay ..). I know it's common with e.g. Lyme, which is why I ask, though my Lyme tests were negative as well.