I took Cymbalta for a few years for anxiety/depression issues. I had mild nausea the entire time I took it, along with other mild side effects.
After dealing with the nagging side effects for that long of a time, I wanted to get off of the medication. I was working at a mental health facility, where I'd worked for 20 years, so expert advice was readily available to me - which was to wean off the prescription gradually, by decreasing the dosage slightly over a number of weeks, because there is a withdrawal effect and it can be significant. The doctor hoped that several weeks' wean would be enough for me.
But in the end, it took me nine full months to get totally off of Cymbalta, due to the intensity of the withdrawal effects. Withdrawal can be extremely problematic with some psychotropic medications - not because they are addicting, because they're not. But one's body chemistry changes to adapt to them, and trying to discontinue the meds and re-adapt can be very challenging. In the end, I could have stretched out my wean longer than 9 months, because the withdrawal effects were still significant even then. There are websites dedicated to advice for getting off of meds like Cymbalta.
Because I didn't take it for my fibromyalgia pain, and because I didn't appreciate any significant pain relief during the time I was taking it for anxiety/depression, I can't speak to how successful it is for everyone for that use. I would just caution, from the bottom of my heart, from someone who took the stuff and who worked in a field where such meds are commonplace, to be aware that if there is ever a reason to stop taking it, it will most likely not be a simple proposition. Best of luck to you.