Do you think Easthaven is the first time in Andrew's life where he truly doesn't remember everything that happened to him?
How disorienting it must be for him to have gaps in his memory? How he has something he cannot recall, no matter how many times he tries? How it comes back to him in pieces, but never as a whole?
Maybe another reason he never really talks about it is because he can't remember it. He doesn't know what memories are real. He remembers the feelings, the fear, the sickness. But as to what happened to him every hour of every day? He was too drugged to remember every detail.
Did he [Proust] use drugs on Andrew to ensure his own relative safety, to skew Andrew’s take on things should any of this come back to him, to get Andrew so off balance and/or out of his head that he could more easily get the reactions and responses he wanted? - Extra Content (159-160)