Why does no one believe me?

Medical science seeks to match patterns to diagnose conditions: the pattern corresponding to a diagnosis is always largely the same. Functional conditions result in a collection of symptoms that may initially appear to match a medical disease at the outset.  This leads to medical assessment, but following investigation no disease is found. Functional symptoms can change and this variation no longer matches a disease pattern. This results in a mis match between diagnosis and the effects of functional neurological conditions.