I hyself have not heard of an "irritated liver". if your instincts are telling you to try the flush, go for it. we are our own best healers if only we can listen closely enough to what our body is telling us.
re the raw juice and food, this went over very badly for me and I improved much after quitting raw food. if you search in the "ask Andreas" archives you will find more information on the raw food issue. according to Andreas, only some types of people (pitta types) can handle raw food in limited amounts. for many others, its just irritating. it was for me.