May I suggest in such situations to try and avoid personal pronouns where this might be an issue. Instead try to speak more to the situation and events that are happening. Something more along the lines of "I am having problems with my stomach/diet/GI tract. I think it may be the food I am eating, it seems too rich and may be making me sick."

I have often encountered this, (feeling like your Mom) in some of my work history, especially with problem resolution/root cause analysis. It's too easy to resort to speaking in personal terms of "you" and "they". It can be interpreted as accusatory and people take it personally even though that is not how it is intended.

It takes some practice and work, but I am sure you can master it! Like my father used to say: "It's not what you say, but how you say it." And as a corollary, I've added "and sometimes it is how it is heard." Not much you can do about that one.