Cymbolta drowsiness

I currently work a retail job that is a full 40 hours a week, diagnosed with fibromyalgia almost a year ago. I recently got put on cymbalta and I am exhausted all the time. I am a chronically sleepy girl a lot of the time, however the cymbalta I'm assuming made it a thousand times worse. It got so bad. I chugged an energy drink before I went back out on the sales floor. However, I cannot drink energy drinks everyday as I have anxiety and it would hurt my heart way too much. Has anyone experienced this with cymbalta and how did you manage the drowsiness. I'm debating just stoping it