It's best to get examined by a doctor bas soon as possible if u have access to him.
The danger signs are repeated vomittng,loss of consciousness,bleeding from anywhere,convulsions.
If these signs are not there ,then it is comforting particularly if child is active and playful.
Next Steps
Use ice if there is any swelling.
thrombogel if any hematoma.
Health Tips
watch for danger signs as mentioned above and see doctor immediately if they are present.
An initial exam by doctor even now will allay your anxiety.