title_body: How bad is it for people with nervous tension to have coffee?
upvoted_answer: Caffeine effects everyone differently, both physiologically and psychologically. If your doctor(s) say to avoid caffeine, I would heed their advice. 
  
  Getting off caffeine can be uncomfortable but totally possible - start to reduce the amount you have every day (e.g. switch from regular coffee to regular tea to decaf coffee to nothing), and you will minimize headaches. It will take time to readjust to normal (2-4 weeks for me, but again, everyone is different), but it will happen, and you will notice you feel less anxious and more calm and steady.