I used to get these split second emotional flashbacks all the time, primarily when stressed. They were usually about embarrassing or frustrating moments, and would very frequently cause some kind of verbal twitch - usually these compulsive phrases like "I want to go home" or "I hate this place" or "I hate myself". Very embarassing in the rare instances it occured around other people.

Meditation seems to have brought down their frequency a lot. Or at least, of the many things that have changed, the frequency with which I meditate seems to correlate most closely.