I was given IV fentanyl yesterday for pain post cataract surgery. Was discharged 15-20 minutes after the injection, became quite ill enroute to home, profuse sweating, dizzy and I fainted I guess, family states I was unresponsive for a short period of time. When I woke up I voided incontinently, vomited profusely. Should I consider this as an allergic response/adverse effect and steer clear of this med in the future if I should have to have any further procedures?