OMG my almost 2yr old does the same thing but she doesnt have but a few words that she can say so she doesn't scream any words just screams and almost noone believes me bc she only does this a home. Until yesterday that is, we were at a friends daughters party and she did it. Everyone just looked at me like what is wrong with her and i just explained that I have no idea and she does this almost daily. I dont know what to do. Someone suggested that i ask for a brain mri and i want to do that but i feel crazy asking for one. I know that there is definitely something going on. I have a lot of mental disorders in my family and I have always suspected bipolar. The first time she did this was the day of her 1yr checkup after her shots and she bit me so hard that is actually just sat in the room and cried for a few minutes. I still had bite marks on my shoulder when i went to bed that night and appointment was around lunch time. thats just how hard she bit me. She hits her head, scratches, kicks, hits, pinches herself and me too. she gets worse when i talk to her and touch her. i just try to keep her safe and let her lay on the floor where i can see her and keep her away from anything she can hurt herself with. she puts her fist in her mouth and chokes herself and pulls her hair to. then later after she is done she wants me to hold her and acts like she is happy and like nothing ever happened. she is a happy baby except when this is going on.