I would ask him the question you posted here and give him your feedback: "In theory I know that it was not me who made him feeling sick but this what happened to me; however, I have the feeling that I was involved in "my story" so actually I made him feel sick... I don't know, I don't like the word "sick", he could have said that he felt sorry for me or whatever...

I still have not finished my story, so now I don't know if I should continue, stop, talk about this what he said..? I would not change the T but I don't want to make him feeling sick..."

I might have a similar reaction if my therapist had said that, I think it's worth bringing up so he can reassure you he can handle the disclosure and better explain what he meant. My T hasn't used that word exactly, but she's said disgusted and horrific, and things like that.

Good luck!