Is so done with this aggression with my ODD, ADHD, Pervasive Developmental Disorder (PDD)-not otherwise specified daughter. I can no longer leave her alone in the same room as Her 17 month old sister. She grabbed her around the neck for NO reason this afternoon. She has always been aggressive with her older sister, but this was a first with her baby sister. then later threw a little chair across the room again for no reason. When asked why she did both things she said, "I do not know, I was just feeling so mad" But nothing happened to make her mad! Really hope her néw behavior services we start tomorrow help! Anyway, just venting, I am so lost with what to do anymore and just broke down crying to my hubby just now! thanks for listening!