I am looking for the title of a SF novel (I think from the 70's or 80's) that includes a drug allowing its users to relive past events of their own lives. At some point there is a cult using this drug to "help" his members to do a kind of "deep" psychoanalysis by relieving traumatic events of their life. The catch is that this "re living" happens at the same speed as the original event.
One of the character (the wife of the main character I believe) is planning to re-live all of her life from the start to get kind of "clear", as she is about 30 this process will take her 30 years and she will be 60 at the end of her "analysis".
I just can not place this story, I would like to read it again, any help is appreciated.