nausea/vomiting
"To cut a long story short, I got septic from failed appendicitis operation as a teenager. On morphine to help with the pain I got the sickness and spent some time on another anti-emetic. This stopped working eventually so I was given a cyclizine injection. I vividly remember my leg going into convulsions, watching the fear in my mum's face as she stood by, then my whole body shaking uncontrollably with sweats. I passed out soon after, woke up with no idea how much time had passed but was told I was allergic to it. Horrible reaction to an horrible drug."