I'm surprised, to hear this, are you saying you can't have any caffeine?
Wow, I've heard too much is not good, but never has our pdocs said none at all.
I know some of their reasoning may be due to increase in urination,which may effect your Lithium level,but total withdrawal from caffeinated coffee,that is really rough,see if he/she will allow at least a morning mug.
Take care now,
DE