Hmmm, if you got it for PC (which i know you are not) i am sure that 3rd person would be possible thru a few console commands (Like almost all the valve games are) although, what the commands are and if it will actually look any good - i don't know.
Also:
Turn on more lights. Playing in a dark room is bad for your eyes anyway.
Sit further away from the TV.
Your body can get used to it after repeated sessions (a pattern of playing and getting sick, stopping, and then restarting later when you feel better until you stop getting sick entirely) when your brain finally realizes that what you are seeing and doing isn’t actually harming you. That process of getting used to it can take a while and isn’t pleasant, however.
There are some medications that help (Dramamine, Bonine, Meclizine and Benadryl) and while they can work, they also all make you drowsy. Not good for gamers and I do not recommend them.
Recommended Treatments: From my first hand experience, I recommend a couple of things. Ginger pills work tremendously well and don't have any side effects. You can also try special wristbands called "Sea Bands" that put pressure on a nerve in your wrist that sends the motion sickness signals to your brain. Take a ginger pill and put on the wristbands before you start playing. Combine the two for better results.
Source:
I have used used them "Sea Bands" myself in for car motion sickness and i must say that they really do work.


