I got remarried 3 years ago and I now have a step son as well as my own 2 children. He is 5 years old and whenever something doesn't go his way he he hits himself aggressively on his head and says hes dumb and stupid. Sometimes he just throws himself to floor and cries or becomes angry and ruins/throws whatever he has on his hand or near him. Simple crafts that dont look perfect to him or slight mess up he cries or freaks out. Sometimes when all kids are playing he will go play alone or just sit and watch, but its like he drifted into day dreaming while sitting alone. Sometimes he comes angry with my son the same age and chokes him aggressively. All the kids love eachother so much. When talking to him he never looks you in the eye but maybe a quick glance. His mother acts like everything is perfect and there are no problems. He is very intelligent at 4 he was reading any word in front of him. I am just becoming very concerned because seems like each time we get him the tantrums get worse and worse.