You have just found the perfect reason that EVERYONE needs healthcare directives!! There are living wills, durable power of attorney for healthcare, etc. A copy should always be given to your doctor, family, and anyone else that needs one.
Here's a site that creates one for your specific state (US only) http://www.legaldocs.com/htmdocs/livin_st.htm
Here's a site that helps explain it all. http://estate.findlaw.com/estate-planning/living-wills/