I have never been on Divalproex, but I do know about side effects. Weight gain is one of the major one, but it is proven as one of the most effective meds for BP. I wish there was something I can say to you to change the circumstance, but I can't. I would definetly say that diet and excersise should help, but I do not know how far they will go. I would talk to your Dr. about what you can do to minimize the weight gain. I am on Lithium, and it makes impossible to lose any weight, but not too hard to gain. Also, everyone is different, what makes one person gain weight does nothing for another. You should talk also talk to your Dr. about other option if you are nervous about it. Best Wishes!!!