My grandmother lived with us for a few years before migrating to sunny Los Angeles. What I remember well about her was how scared she was all the time.
http://host.madison.com/wsj/lifestyles/health-med-fit/advice/dr-zorba-paster-worrying-really-can-be-harmful-to-health/article_b9b37002-b6db-5dfc-8a47-471abbe42cd0.html
Dr. Zorba Paster: Worrying really can be harmful to health