You may need to ask Hulda Clark about this. I am not in favor of doing the cleanse without softening the stones before the liver flush and cleaning out the colon before and afterwards.
There are too many potential problems that can occur when it is not done properly, including the one you are experiencing. I would take a tablesoon of Epsom salts in a glass of warm water, but not repeat the flush without following the complete directions (see The Amazing Liver Cleanse, www.1stbooks.com).