THE SILENT PATIENT'I love him so totally, completely, sometimes it threatens to overwhelm me. Sometimes I think . . . No. I won't write about that.' Alicia Berenson writes a diary as a release, an outlet and to prove to her beloved husband that everything is fine. She can't bear the thought of worrying Gabriel, or causing him pain. Until, late one evening, Alicia shoots Gabriel five times and then never speaks another word. Forensic psychotherapist Theo Faber is