I'm not sure it's going to be easy to come to a conclusion. You've got a whole ecosystem down there. There is all sorts of stuff in the ayahuasca brew that is going to impact that and sometimes a die off of microorganisms can exacerbate "autoimmune" conditions temporarily before eliminating them. So it's hard to tell if your getting worse is actually a symptom of getting better, or whether it is strictly a contraindication. Many folks down south consider ayahuasca medicine for virtually everything, but we tend to approach medicine different in the west. What you could do is try a b. caapi only brew. Start small, dose consecutively and see if the symptoms pile up or if they peak and then subside. The former would suggest to me a contraindication whereas the latter would suggest a sort of "healing crisis" (aka jarisch-herxheimer reaction). But of course there are so many unforeseen variables I couldn't stick to that as a hard fast rule. It's just a scenario that first comes to mind out of personal experience. I have Lyme disease which caused an autoimmune condition known as CIDP as well as some undiagnosed rheumatic issues. Any time I take anything antimicrobial be it an herb or drug I get a massive flare in symptoms followed by remission presumably due to the ejection of inflammatory debris from the the dying bacterias cell wall and inner compartments. B caapi is known to be broadly antimicrobial and I wouldn't doubt chacruna is as well. In an intestinal inflammatory condition there is always a chance a certain plant medicine illicits a temporary inflammatory response by this means. But of course that's just one consideration from one particular angle.