My heads about to explode

For whatever reason Emmett has been screaming ALL morning. When I say sreaming, I mean ear piercing and headache inducing screaming. I have no idea what's behind this but we need to figure it out. I don't know if he's in pain or just overwhelmed. This is when I find the speech and language delays to be the most frustrating. I want to help him but I don't know how because he can't tell me what's wrong. Helpless doesn't quite say it....