experience a flashback

Translations
переживать воспоминание
He experienced a flashback during the therapy session.
Он переживал воспоминание во время сеанса терапии.
Definitions
To suddenly recall a vivid memory from the past, often triggered by a specific event, sound, or sight, which can evoke strong emotions and sensations associated with that earlier time.
Words
experience

verb
испытывать
a

article or possessive pronoun
один
flashback

noun
воспоминание