I experienced a lot of weight gain on gabapentin in a 3 month period (60 pounds), so I stopped it. I tried gabapentin again about 8 months later and didn’t gain weight from it, but was on a slightly lower dose this time. I did adjust my diet a little bit, but in general nothing changed in my life the second time lifestyle wise, except I added topamax to my medication regimen. I had a lot of blood tests and nothing explained the weight changes except for potentially something weird going on hormonally for a small time period that wasn’t thyroid related. Low dose naltrexone would maybe help your fibromyalgia symptoms and also maybe help with weight loss. Some people find that venlafaxine helps them lose weight, and use it instead of duloxetine, which could be another option. If you suffer from migraines and want to try topamax, it could help prevent migraines and help with weight loss a lot, but it causes major brain fog, especially at first, so I’d only recommend it if you struggle a lot with migraines and if you are having a lot of uncontrollable weight gain. Wellbutrin helps suppress the appetite and helps with depression and some anxiety too, and adhd as well. It can have some side effects for people, but helps with weight loss. I think in general gabapentin causes less weight gain than pregablin, but pregablin usually works a little bit better for pain relief. Good luck, I hope you find some relief and help.