The scary thing is that Starfleet probably needs a separate support group for “people who have accidentally lived decades/entire lifetimes in alternate realities until it turned out it was just an hour in the real world.”
What? Oh, no, you’re looking for the “I was caught in a timeloop and went insane” support group. That’s next door.
“Mirror Universe trauma”? Down the hall.
“Dealing With My Duplicate Self” meets on Thursdays.
(O’Brien just attends all of them. If it hasn’t happened, it’s probably going to.)