I was often nausious a day or two after amalgam removal. Some parasite cleanses contain herbs that are laxatives(like senns, buckthorn(cascara), etc., while the typical antiparasitic herbs likw black walnut green hull extract and wormwood have a mild laxative effect. Which parasite cleanse are you using? What does it have in it? The antiparasitic cleanses are also very antifungal, so you may be experiencing a candida die off reaction. Taking extra B vitamins, vitamin c, and 500 mcg to 1 mg a day of molybdenum will probably help with this. You cold also try licorice root tea or milk thistle extract to help with detoxification. Remember to drink plenty of water while doing a parasite cleanse.