Old Gallstones are infected with bacteria, and also old Gallstones and old bile are full of heavy metals. Taking 5 or 6 grams of sodium ascorbate (vitamin c) after a flush should help with the detox symptoms.
Other things that would help..
1. Go gluten free for the long term.
2. Methyl cobalamin (methyl b-12) under the tongue, methyl folate (so called methylation protocol).
3. 100mcg selenium
4. Look into chelation (iv edta and oral DMSA only) to remove old heavy metals.
5. Make sure to take long enough breaks in between flushes, 1-2 weeks at least.