Hi - I started taking fluoxetine mid-December. I did put on some weight at first but it was also Christmas so I really can't put that down to the drug. I started WW in January and it doesn't appear to have affected my weight loss at all. If anything I find that because my mood has lifted and I have become more enthusiastic about things again, I have made a real committment to the plan and have become a regular exerciser, and of course, exercise itself is supposed to be good for depression.
Not that any of this helps you, but this is my experience. Is there maybe anything you can do like more exercise? You may be doing that already but you haven't mentioned it.
I also try to keep a little journal in which I set a few small goals for myself like track everything I eat, earn x number of activities points, walk to station and back instead of getting the bus etc - it's normally more or less the same thing every day, but it is satisfying to tick them off. I also write something down which I did well just to give myself a pat on the back and something I am grateful for - just small things like it is a sunny day. And then if I think I deserve it, I stick a gold star in lol. It probably sounds a bit daft but it is supposed to lift your mood and the daily goals keep me on track.