"i&#039;ve been on many ssri&#039;s years earlier and didn&#039;t want the weight gain again so i got on cymbalta. i was very dizzy, sick to my stomach and really really tired. i spent almost 3 weeks in bed. i suffer from low cortisol which causes fatigue and after reading about cymbalta it lowers your cortisol levels by 40%, so i&#039;m back on paxil which raises your cortisol levels."