High Maintenance

 I'm wondering, is there a medical slang term for people who seem to make a career from collecting medical opinions on problems they may/may not actually have, and refusing to believe the doctors are doing all they can? Further, they are convinced they aren't being taken as seriously as they feel they should be, despite the best efforts of the medical folks? I've thought of 'high maintenance', but that'd be both obvious and tame! ;)