My 18 month old was dancing goofing around when suddenly he threw himself back hitting the back of his head. It was really loud and sounded really bad. He quickly sits rubs the back of his head and starts to cry. He has history of breath holding spell but he did not stop breathing so he did not faint and got over it quickly. He does have a bump on the back of his head but other then that he’s okay. I’m just a little worried and can’t sleep.