Nervosa means "the psychological addiction to a behavior, belief, or habit".
An example would be Anorexia Nervosa. Anorexia being in which someone starved themself / a serious mental disorder, where people (usually females) have a strong need to lose weight. When you combined Anorexia and Nervosa it would mean the addiction to the behavior, belief, or habit, of starvation.
a tv talent induced nervous mania - characterised by the incoherent ramlings of middle aged women, often following rejection by wide social groups.
Had Sharon O taken a pill before the show on saturday evening as she was mumbling, could not be understood and had developed strange dance like twitches?
no - its was more likely a case of Boylemia Nervosa. see also Boyles Syndrome