Hi - The vegetable juicing and colon cleansing probably triggered some major detox, which triggered some healing crises. The symptoms you described are typical for healing crises, also known as cleansing reactions or Herxheimer reactions.
Any type of cleansing you do will put a strain on your adrenals. The symptoms you've described are severe, and probably indicate a major strain on them. A Liver Flush now will probably cause more of the symptoms you experienced with the vegetable juicing and colon cleansing. It will also put more of a strain on your adrenals.