Have you tried LBB (Lower Bowel Balance, Dr. Christopher's formula, made by Barefoot Herbalist)? I use that and his dewormer and have only had a bit of nausea a couple of times. I just cut back a bit on the next dose and that takes care of it. The LBB is non-habitforming. It is only herbs that cleanse and stregenthen the natural action of the intestinal track. I hope this helps and that you feel better soon.
God Bless and Happy 4th,
Texcen