bluehiroko,
You'll have to try and see how caffeine affects you, I still love my espresso drinks and have found that using decaf espresso beans will satisfy my need without twitching like a chihuahua for hours afterwards.
I, too, have tried green teas, but they also contain caffeine, but there are some decaf green teas too. Try various kinds and see how they taste.
For me, caffeine makes my sensitive brain too zingy and twitchy so I only have maybe one cup of caffeine a week, otherwise it's decaf.
Mike
