Hi my 14 y.o son while playing video game on PS3 gets dizzy or vertigo after a while then he stops. What the cause of this? Anyway to stop this?

Flashing light. The flashing lights and explosions that are depicted in video games may trigger photoconvulsive seizures or migraine episodes that can present with dizziness. Speak to your pediatrician about getting an EEG with photic stimulation. Also consider a referral to a pediatric neurologist.
See pediatrician. The animated/3-D effects on video games which mimic real life may trigger your son's symptoms. Think of a pilot on a virtual training system. Have him see pediatrician for exam/evaluation. S/he will know what to do or refer to specialist if necessary. Hope this helps.