What are Monet's symptoms?

Seven days after the trip to Kitum Cave, Monet develops a severe headache. He decides to stay home from work, but the headache only becomes more intense and is soon joined by a backache. Three days after his headache begins, Monet spikes a fever and begins to vomit uncontrollably. His personality changes – he becomes sullen and resentful to his housekeeper – while his face becomes frozen in a mask-like state. When his eyeballs turn red and his skin takes on a yellowish shade, Monet’s housekeeper fears that he is turning into a zombie.