You might want to google encropesis. If this was a one time thing - I wouldn't be too concerned but if it is ongoing - this could be his problem..
You can build in "breaks" into his playing video games schedule - maybe set a timer......
Limiting video games may do the trick as well......do not forget that he is only five
The excessive use of video games is in your hands, also computer gamnes it sounds too much especially as he is only 5 year old, is there something he is upset about, has he aan older sibling?
He actually has a 1 1/2 year old brother.