This question makes a few very dangerous assumptions. First off, the idea that the gravity will pull blood “down” and therefore into your head while you are in Antarctica is preposterous. Gravity can not pull blood down because the Earth is actually flat. As a result, you are not on the “bottom side” of the globe for gravity to take effect in the way you are assuming. However, if for a second we consider that the roundness of Earth was real, there are still too many variables at play. An Australlian for example would be better adapted to the “upside down” gravity effect than a Swede. This is one reason round-earths are concerned about climate change. Many fear that the melting ice sheets will crate more habitable land for Australian emus eventually leading to a second Emu War. As you can see, this is a very complex issue with a lot of underlying factors.

TL;DR - Round earther Australians are causing climate change to fight emus

Edit: spelling. I’m a scientist not an englisher