What happens if you are to suddenly stop in taking caffeine once you are massively addicted to it?

Question: What happens if you are to suddenly stop in taking caffeine once you are massively addicted to it?
- Keywords:
  addicted,
  caffeine
Asked by PurpleSquirtles to Craig on 15 Jun 2015.
- Craig Doig answered on 15 Jun 2015:
  
  ha! I get a headache.
  This is because my blood vessels are used to the caffeine and so when they don’t get it every morning my blood pressure changes and it changes the pressure of the vessels in my head and that gives me a headache !

Question: What happens if you are to suddenly stop in taking caffeine once you are massively addicted to it?