A couple of flights should be enough to start getting over the dizzy feeling but I'd strongly recommend concentrating on the model. Pick a point halfway along the fuselage and focus on that spot and nothing else. If you're looking at the background then your eyes are flicking from side to side and your head will tend to move as well which only adds to the dizziness. The model becomes a stationary point of reference.

I wouldn't really recommend doing loops and 8's while you're still having your first flights but later on it's good fun doing them with your eyes closed.