For 'wellness', naturally, is no cause for complaint - people relish it, they enjoy it, they are at the furthest pole from complaint. People complain of feeling ill - not well... Thus, though a patient will scarcely complain of being 'very well', they may become suspicious if they feel 'too well'.
The Man Who Mistook His Wife for a Hat: Picador Classic (ed. Pan Macmillan, 2014) - ISBN: 9781447275411