I'm sure lots of others have already responded, but I thought I'd respond anyway. My son did this from a slightly earlier age, about 13 months through about 16 months for all the same reasons as your son. It was mild at first, and then got more violent and urgent. At first we were completely shocked and scared! But, what worked for us, was to see the head banging coming, and to pick up our boy and hold him tight and tell him "ouch, stop, you'll hurt yourself" and gently calm him. It would sometimes take a while for him to calm down, but after about four or five times approaching his hysteria this way, he slowly stopped doing it. Since I have depression myself, I am always concerned if my son exhibits unusual actions. I spoke with my psychiatrist about this, and he said it is perfectly normal (although possibly injurous) and that our approach was a good one. He said that LOTS of children will act out frustration, anger, and even sadness this way. Just love you son, keep him from hurting himself when he is frustrated, and he will learn that he is safe, and his desires are being met. You will build his self-confidence every time you show him that his feeling count and that you acknowledge he is angry, frustrated, sad. Our boy ourgrew it pretty quick. Best of luck.