Thank you for your query,
The paleness of face may be a response to his pain due to headache or stomach ache.
infections, tooth related problems or a migraine
like condition to be ruled out.
For symptoms you can give Tylenol
in prescribed dose whenever required.
But consult your Pediatrician
for physical examination , to correlate his symptoms with examination findings and if needed for further investigations.
Hope I have answered your query.