I have always been a bit freaked out by the major liver and gall bladder flushes that some people do here. I know that some report great success with them, but have read the odd horror story. I think that if I'm dealing with adrenal issues as well, it's best that I wait until those glands are in better shape before attempting a bigtime flush. Though I will keep them in mind.
I once did a vegetable juice fast, only for a couple of days. It's hard to recall just how I felt when I did it.