We went to the ER two weeks ago because my youngest had a mild concussion from hitting her head on the concrete. She was sluggish, complained of a headache, and vomited 4x. The vomiting was what caused us to bring her in. She had a CT Scan and it came back negative/normal. We were told it was mild and that she should take it easy for a couple of days. She is fine. We did not go in for a follow up visit. They gave me information on what to look for if there is more of a problem.
I don't go online to look up medical advice. It's way to vague and only causes panic (ie. a pounding headache MUST be brain cancer).