I was the same as you guys, im a 16 year old male and i play my xbox alot
My symptoms (cant spell ^.^):
Dizzy when Sitting - Standing or Crouching - Standing
Sore Head - Constantly
Eyes sore when moving left to right or up and down
turning head to quick made me dizzy too
Luckily mines has almost went away by its self it has been 2 days and my eyes dont hurt as much when i move them left to right, i drank 6 Liters of water over the 2 days (3 Litres a day)
To cure the dizzyness when i stood up (This is gonna sound STUPID but it acctually worked) Lie on the edge of your bed and put your left (or Right) foot on the floor and just lay there for an hour or two, i fell asleep doing this so i was there for 9 hours hehe
It also feels like i have the flu so i took a nice hot bath and i am going to sleep in 5 mins

hope i am better in the morning, Good luck all