Two months ago I found myself sitting on the floor of my living room, sobbing, while the Kangaroo sat in my lap, also sobbing. Only his sobs were different than mine. His were high pitched and keening. They were interspersed with screams and each scream was accompanied by him throwing his head back into my sternum as hard as he could. Over and over and over. Two months ago I didn’t know how to help him be happy. Our days were filled with tantrums, meltdowns, physical aggression, and heartbreak. I would pick him up from school at noon and his teacher would report that he had a great day; seemed…