My son has been a normal active 5year but yday he complained of a headache from then he's been acting strangely he been saying things that don't make sense he won't still for long I'm really worried he also said he can think properly any more please help

1. Call his pediatrician's office even if it's closed today, to leave a message.
2. Take his temp before any liquids.
3. Give him some weak juice or water and if you have any children's Tylenol, one of them, and take his temp 1/2 hour later.
4. Take him to the ER. If he seems worse than earlier this morning, take him to the ER as soon as you give him the Tylenol, or if you don't have any.