Sorry to hear about the nausea, I had it big time when I did the high fat flush. That's one reason I don't plan on doing it again. The results weren't worth the misery. I wish I could give you the advice you need, but nausea frequently happens, sometimes to the point of throwing up. I had bad nausea yesterday morning early with lots of the awful olive oil burbs. Yet I had what was probably the best flush ever, at least in terms of passing big stones. parasites may not be your problem. I would suggest try using less oil next time, then slowly working your way up to maximum tolerance. Also drink all you can hold before 2 pm (or eight hours before you drink the oil) then taper off. Fasting after 2 is crucial for most people, fasting all day is best if you can do it.