A good thing Telman came up with a lot of competent answers... here´s something he/she may have forgotten but I¨ve seen he´s posted it in other places.... using ginger for the nausea. The first time I did a Salt Water Flush (different, I know...) I felt like puking out the Saltwater right after chugging it down. Then read that the temperature of the saltwater needs to be lukewarm to cold and not warmer because this could bring on the feeling of puking.
Best wishes!