An elimination diet.could help but i would scan for parasites as well. If you got such a reaction to biltricide it means you got die off and you need to keep treating for a Tapeworm or flukes for a longer period of time. 1 pill unfortunately does not do enough. You need to read around this forum about treatment plans and forget the doctors. You can order meds online without a prescription. Also switch to completely organic foods without additives. additives and standard supermarket foods are full of toxins such as pesticides and they cause gut and immune system inflammation as well as indigestion.