I face a very similar situation with EEN, basically any formula I try, I go on to have liquid diarrhea, posted about it here: https://crohnsforum.com/threads/een-makes-things-worse-any-advice.87362/#post-1052556So... this is quite interesting. Last Monday week he went into hospital to get his Mantoux test results and his first shot of Humira. He was really very poorly. He'd lost 2 kilos (4 1/2 pounds) the previous week on the EEN which was on top of 4 kilos in the previous 3 or 4 weeks. He couldn't take the shakes without vomiting and was really weak.
That day we gave him some solids and started back on food over the next 2 days. He had this bounce, went from 8+ BMs a day to 3 or 4 and had a huge appetite. Looked and felt much better.
That lasted for a week. Initially I thought that maybe the Humira had given him a kick but the more I read about it the more that seems unlikely in such a short time. I now wonder if the EEN was working and we just hadn't given it the time (and Jude couldn't get the nutrition as he couldn't keep them down). Maybe the previous week had been more liquid in, liquid out than his IBD symptoms not improving. He had no tests in between to confirm one way or another.
Yet another IBD mystery to ponder!
I hadn't heard of SIBO (I've had Crohn's for 36 years myself). Very possibly a factor. Jude had lots of mouth ulcers which magically cleared up towards the end of the week on EEN even as his general condition looked to have dis-improved.
Thanks for all the feedback by the way, it's great to bounce this stuff around.