I'm beginning to think that the horrible feelings may be caused by whatever the parasites may be emitting due to the ongoing threat to their existence as they do not do well with anything that tends to make you healthier (ie: colon cleanse). There is new (to me) info on parasites, and how they affect us, available on Youtube. They even suggest that the parasites may have the ability to manipulate us through craving certain foods they thrive on and other behavioral urges.