Just started on Celexa three weeks ago and have had the first three weeks of IBS free days in the past 18 months! Is this "placebo" effect as I thought Celexa took several weeks to begin working? Not sure if mood has improved other than being overjoyed from not having excruciating pain! Also last night I was fine one second and the next I had this dizzy / hot/ nausea feeling and vomited - bug or Celexa? Thanks to anyone who can offer answers!