Guy Gavriel Kay. First book published in 1984, part of a trilogy that was Tolkien-esque, quite decent, but not exactly ground-breaking. He’s since gone on to something a little more unique, which he describes as “historical fiction with a quarter-turn to the fantastic.” Impeccably researched but set an alternate world that’s a close but not exact mirror of our own. This allows him to take a few small liberties with historical accuracy in service of telling a better story. Personally I think he really hit his stride in 1995 with The Lions of Al-Rassan, and almost everything he’s written since then has been exceptional.
Because the toxins your body is reacting to are already in your bloodstream. It’ll take time for those to get metabolized by your liver, and how much or little you vomit won’t change how much work your liver has to do.