Yes that could be anxiety, I to have had foggy ,head heavy head, tingling head, dizziness, just didn't feel right in my head, so yes yes yes
Well I am no medical expert, but anxiety can cause head fuzziness/cloudiness/whatever you want to call it. Playing games that long can also cause dizziness. doing that for 10 hours fixed on a screen will toy with ones eyes and head. Again I am no doctor so I would suggest talking to your doctor about this. But yes, anxiety can cause your head to feel cloudy.