yeh No2 supplement are pretty cool. They widen blood vessels to allow more oxygen into your blood, which leads to much better pumps.

That amount of Creatine is very very minimal, to the point where it probably would be unnoticeable to yourself.

I wouldn't worry too much.

Studies have shown Creatine to be safe for continuous use, at 21 grams per day for 2 years. So you'l be fine

Your body already contains creatine, as does red meats like beef steak.

I think the light-headidness is down to the increase oxygen getting round your body....but i'm not an expert.