Hi, my 34 months toddler has a cough. This morning, while being in the middle of playing he all of a sudden put his hand on the back of his head (where the head connects with his neck), and started crying, saying that his head hurts. He stopped in a minute and said he was feeling normal again. Is this something I should pay attention to, or ignore? In the last few days his heart has been racing after he used an inhalator to stop cough.