I have been told that I may have PTC due to taking too much Vitamin A for an extended period of time. My head has been swimming and full of pressure for six months and I have trouble focusing. My GP said yesterday she had never heard of this. I read on the internet about Diamox. Since I also have hemochromatosis my liver is probably in trouble. Anyone else taking too much Vitamin A or have hemochromatosis (iron overload disease)?