Forum:Pliskin dizzy spell?

Hello, quick mgs2 question... can anyone explain why Pliskin aka Solid Snake appears to have numerous dizzy spells during the Big Shell chapter? For instance, after the first cut scene with Vamp, Pliskin seems to go dizzy and need to sit down. My initial thought was that it was foxdie when I first played it, or was it not that important and Snake just being tired?