The most important thing here is you figuring out what is really going on with you and caring for that.

If your friend is a true friend, all will be fine about her having told your personal info to the coworker. I’d give your friend a pass because the coworker was present during the trip, so her telling her was an innocent ‘mistake’. When you have the talk with her about the email, I’d just ask her to please not tell anyone else.

Not to minimize your situation, but I have learned that my friend of 40 years has been telling everyone who knows us both that I have Borderline Personality Disorder AFTER I have explained to her time and again that the several doctors I have seen have said I do not have the disorder (only traits that came out due to severe bad marriage). What a “friend”, huh???