Two things: there are many ways to do a liver flush, so maybe you should try a different one. My preference is for the three day apple fast followed by olive oil.
The other thing is: your liver may be congested due to parasites, which is very often the case (as was with me too). When you have parasites in your liver, you don't necessarily feel that much better after the flush; you may not even better at all, and once I actually felt quite a bit worse after the flush! In that case, you need proper therapy for the infection, rather then a flush.