title_body: Why do I feel lousy, low, out of energy after the high coffee gives?
upvoted_answer: This effect is known as caffeine withdrawal. It's normal that you may feel a bit loose of you don't have caffeine after a while. The whole set of adverse effects of caffeine withdrawal is enlisted as:
  
  
  headache
  fatigue
  anxiety
  irritability
  depressed mood
  difficulty concentrating
  
  
  according to WebMD.