Going through a bit of an angry phase of the friend dying thing. After he fell and hit his head against the coffee table, I thought he had gone to the hospital to be checked out. Turns out, he didn't. He did complain about some head and neck pain for a few days before he started talking incoherently, at which point, he was taken to the ER. At that point, he was hospitalized with a brain bleed.
If you ever hit your head, especially if you experience neck or head pain, get thee to a doctor.