I personally felt that Andrew had to be faking his final relapse. I judged his nod to the head psychologist and his willing standing up and walking with the guards, orderlies, and Nazi psychologist to be an indication that when he said, (paraphrasing) "Is it worse to live as a monster or die slowly with no feeling?" or whatever he knew what his words just prior to that, speaking as though he still believed his PCP was still Chuck, would result in him and he desired that emotionless, memory-less outcome as opposed to living with the undeniable knowledge of his children's death and his consequental murder of his wife.
My girlfriend just simply felt that he relapsed and didn't get that explanation ?_? But it was 12:30 AM when we got out so I'll cut her some slack...