Fat but Happy

Why can't researchers come up with an antidepressant that causes people to lose weight rather than gain it?? I'm so happy to be stable mood-wise, but I can't stand the weight gain side effect. The only way I have ever lost weight is to taper off the antidepressant, then after about 9 months I can finally get the scale to budge downward. And to top it off, in January I was diagnosed with Fibromyalgia. According to my doc that explains a lot about my health including my inability to lose weight. I'm still going to make every effort to exercise, even though most days I am exhausted and achy. It's not the ache that you get when you work out too hard; it's a weird, burning ache in places that you weren't even exercising. Sometimes I can walk fairly easily and not get too winded. Other days, I feel like I'm 90 years old. And I can never build up any endurance. This is not like when I was younger. I was in great shape! I could do 60 minutes of step aerobics and feel awesome! There was nothing like the endorphin buzz. But then I started to have asthma attacks induced by exercise. Soon the darkness of depression engulfed me and I wasn't motivated to work out even though it was the best possible thing I could do. And then the chocolate cravings set in and it was goodbye to my conditioned body. Yuck. So, if you're reading this and you're a researcher, please, invent some antidepressants that cause weight loss. I'd be most grateful.