You may have a very congested bowel with lots of mucoid plaque. Andreas makes it very clear in his book that a congest bowel will impede liver flushing. One guy says (in the book) that he got a colonic and he literally passed hundreds and hundreds of stones that got hung up in his bowels when he would flush.
Stannarad gave you lots of good advice, too. The Bitters and Coptis is what I take daily, and I wouldn't miss my daily doses for the world.
Julia Chang took herbs for 4 months to strengthen her liver before ever attempting a flush.
Too many people come here and read and attempt a flush without understand everything else involved in it (that's not directed at you personally!). You really do need to prepare your body for a successful flush.