Husband suffered head injury, what to do?

Too vague: This is an incredibly vague ??? If you are concerned you can call your local ER and speak to an RN. If it seems more urgent, go to the ER. Hard to say much more than that given the wide spectrum of injury possible.

Head injury: Treatment is based on the severity of the injury - with a skull fracture, significant loss of consciousness, nausea and vomiting and other findings the patient would need an extensive inpatient workup. Head injury without loss of consciousness and external signs of trauma other than scalp bruising is normally just followed. If no new neurological symptoms occur then no intervention is needed.