Information about head injuries and seizures

Or brain injuries and epilepsy (see an earlier post).

Here are some sources of patient information about head injuries, seizures, or both:

NHS Choices - Epilepsy - Causes

NHS Choices - Severe head injury
A head injury is "severe" if it involves unconsciousness or a low score on the Glasgow Coma Scale.

Neither of these is, as they themselves will tell you, a substitute for a doctor.