I have green diarrhea I've been taking new vitamins and eating extremly healthy all of a sudden. Also have been drinking green tea. What is wrong?

Diarrhea. Can be caused by numerous things and may not at all be associated with your vitamins or green tea. This may be an acute viral illness, but if it persists past 72-96 hrs see a doctor.
Fiber increase. If your new healthy diet includes more fiber than you are used to that could lead to more rapid transit through the gut with moister stools.