Your posted stuck a chord with me, mainly because I was noticed my child was different from early on. I was terrified that he had autism. Later I learned that he has ADHD. My child always seemed unhappy, and I seemed to have difficulty bonding with him early on. He just always seemed irritable, like everything bothered him. He also displayed many of the symptoms you are seeing in your son. It became more apparent as time went on that there were issues, and he was formally diagnosed through his pediatrician. Medicine helps a great deal!