I am so sorry to hear about your plight! It is so difficult to regain lost health, and to have real serious setbacks while trying to get better. I have had many setbacks, too.
Have you considered that a stone may be stuck? Or maybe something is going on in your pancreas or gallbladder that the doctors missed? Or maybe there is a parasite that was released during the flush that is now causing bowel problems?
If you have a holistic doctor, perhaps he/she could give some advice. Also, an Elimination Diet may give you some clues as to what may be aggravating your symptoms.