My 11 month old son has a piercing, hideous screech. It's high pitched and it makes me want to rip my ears off. It physically hurts me to have to listen to it. My ears are in pain right now. I have tried saying "no" loudly. Nothing works. He does it I'm sure to get my attention, but I cannot handle it. It's all the time. Every single thing seems to bring it on. It's also embarrassing. It's got so bad I have actually shouted at him which makes me :( because I know he doesn't know what he's doing. I've had to leave the room he's in. Please someone help.