I found that Cymbalta (duloxetine) works well for me, but only when combined with a stretching and walking regimen. I have been using it for almost 3 years and maintained my weight. But I find if I revert to my "couch potato" self, the pain and aches come roaring back, so it isn't helpful by itself. Since you have spent a year getting weight off, you probably already have a good exercise program, so if you continue, maybe you'll be okay.
Sue