I know the meds act differently for everyone. My aunt lost 35lbs when she took paxil. Everyone else I know has gained weight, including me. I gained 40lbs on zoloft. I had to really watch what i ate and make sure to exercise. I found that I was hungry all the time. I would have dinner and be hungry an hour later and have another whole dinner. I would eat breakfast at home get to work and feel starving and have a bagel.
I did loose the 40 pounds. I did LA Weight Loss, which was at the time similiar to the old weight wathcers, where you have a certain number of protein/starches/fats per day along with lots of water, 4 servings of veggies, and 3 fruits. LA weight loss closed here in NJ. But I still pull out all of my stuff and follow it when I start to gain weight. It taught me portion control and how to eat healthy. I know many people have success with weight watchers as well for learning how to eat properly.
My advice... eat healthy and exercise. Try to schedule and plan several small meals so you don't ever get too hungry, and snack on fruits and veggies. I used to set times that I would eat. For me it was 8:30 am, 11:30am, 4pm snack, 6:30 dinner, 9:30 snack. I know that it wasn't until I gained 40lbs that it hit me and affected my mood. None of my clothes fit, it contributed to my anxiety/depression and it took me over a year of dieting to loose 40lbs.
Antidepressants are really good at helping our anxiety, but for some people they do increase appetite. Just watch what you eat, drink lots of water, and get some exercise, before you gain too much weight and have to really go on a diet.
I really craved sweets on zoloft. Two healthy snacks that helped my cravings were. Plain oatmeal made with splenda and cinnamon or even pumpkin pie splice and the 100 calorie chocolate pudding cups.
Good Luck