how does christopher feel after discovering his father had been lying to him

After the forth letter Christopher feels giddy and sick that his father lied to him that his mother was dead. He lies in bed curled up. Christopher doesn't remember much after that - just waking up after dark with vomit on his bed.

His father walks in, realizes what's happened and apologizes and apologizes. Christopher is quiet and feels him touching his shoulder but he doesn't mind. When he lifts Christopher on to the bed to take his clothes off and put him in the bath, he doesn't mind either.