Denise, the good news is cocoa is thought to have cancer fighting components:
http://her2support.org/vbulletin/showthread.php?t=43594
If you can consume it with minimal sugar or a sweetener like Stevia, should be all good. There are some options aimed at diabetics that can help with that craving.
The coffee issue (estrogenic) is at this point an issue in ER+ cancer. But caffeine itself tends to raise cortisol and reduce the quality of sleep, which will at some point likely be correlated to the "stress" issue mentioned elsewhere. But if you get more stressed without it....
Rhonda,
Do you have the study showing green tea interferes with treatment? I have tried to compile info on green tea and haven't encountered that yet:
http://her2support.org/vbulletin/showthread.php?t=44079