My 6 year old son hit the back of his head at school about 8 days ago. He has been complaining of headaches, chest pain, belly ache,and he has not had much of an appitite since then. He also has symptomps of what i believe is allegies, red swollen itchy eyes, dark under the eyes. I dont know if these are connected but i wanted to know if i should take him in to the ER?