Hello, If you are hungry for long before these episode it can be simple hypoglycemia and you can get better by having some sugar and eating/drinking something. Is the headache throbbing type? If yes then it can be migraine which gets precipitated by sunlight and bright light (video game) along with nausea and dizzyness. But headache in migraine is generally severe than mild. Another possibility is panic attack if associated with palpitation, shortness of breath, tremors, choking sensation, sweating and impending doom. If you had any fever or infection you may need some investigations. In any case if your symptoms are persistent you should see a doctor. Hope your query is answered. Regards.