My son is nearly 3. He is non verbal i think ASD but not yet diagnosed. When hes angr/upset he will throw himself back on to anything lift up his head to bang it back down onto floor/wall. And now has started to slap himself really really hard in the face. Hes so strong i dont know what to do i always try to calm him down and figure out what he wants or whats upsetting him i know hes frustrating because cant tell us verbally. But how can i help him i feel he really is going to cause injury if this carries on ☹️